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                                        XFLR5

                     A tool for the design of Airfoils, Wings and Planes
                          operating at low Reynolds numbers

                                 Copyright (C) 2003-2019

                                     Andre Deperrois


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xflr5 v6.47 July 7th, 2019
    - Fixed the problem of initial settings when running an LLT analysis
    - Modified the color display of Cp coefficients in the 3d view, to render more accurately the uniformity of singularities on panels
    - Added an option to align the children objects style with their parent's style
    - Fixed a couple of crash bugs when editing a part of a plane with an active polar
    - Fixed potential crash bugs when editing plane parts during 3d animation
    - Fixed potential crash bugs when deleting planes or foils from the Manage options
    - Fixed a crash bug when running a 3d panel analysis from and old project files due to no wake defined
    - Corrected a minor output error in LLT analysis
    - Fixed potential memory leaks when loading corrupted project files
    - Tentative fix for bug #140
    - File name cleaning
    - Code cleaning


xflr5 v6.46 May 4th, 2019
    - Fix for bug #134 - LLT now restored in v6.46
    - Fix for bug #139 - corrected crash bug when switching from plane design to another app with streamlines displayed.
    - Fixed some minor other issues
    - Code cleaning


xflr5 v6.45 April 10th, 2019
    - updated the German and French translations
    - added VAO support for the OpenGL 3.2+ core profile
    - fixed a crash bug when trying to plot BL graphs without an active operating point
    - corrected the names of some variables in boundary layer plots
    - corrected imperial unit conversions in the foil polar definition
    - changed the unix directory for shared files to /usr/local/share instead of /usr/share
    - increased the sampling of the foil's mid camber line from 100 to 1000 points; this improves
      the precision of the calculated camber and thickness value and position
    - disabled the auto-check for update feature due to crash bugs on some systems
    - added error management to the check for update process
    - cleaned up all .pro files
    - code cleaning

xflr5 v6.44 January 7th, 2019
    - tentative fix for an occasional crash bug when displaying streamlines or surface velocities
    - fix for bug #128 relative to the display of the wings and body in the advanced plane editor
    - fix for bug #126 relative to the highlighting of frames in the advanced fuse editor
    - feature request #127: shortcut added for the menu entries "show only associated polars"
    - fix for bug report #121 - synchronized the background image position with the object views
    - mod for request #124 - added an option in the spline parameters to force closed LE and TE.
    - prevented the multiple repaint of surface velocities in the 3d view
    - corrected minor errors in the derotate operation of airfoils
    - corrected translations errors from fortran to C in the XFoil flap setting routine - thanks to Nicolas C.
    - added an optional automatic check for updates at startup
    - completed the archiving of the default plane polar with all of its data.
      Incremented the format of the project file to 200002.
    - corrected a crash bug when trying to overwrite a saved foil operating point
    - code cleaning


xflr5 v6.43 August 27th, 2018
    - improved the VLM mesh of flapped surfaces with hinge points located at different %chord
    - corrected a bug in the display of inertia values for a wing or body - no impact on results
    - fixes for request #117 relative to the construction of double fins for a plane with a body
    - corrected the wrong sign of viscous pitching and yawing moments - slight impact on results
    - forced thin surface analysis whenever more than one wing is defined
    - set the "ignore body panels" to true by default in the definition of the 3d analysis
    - corrected the calculation of the tail volume for wings with an offset leading edge
    - corrected the asymetric position of double fins
    - corrected a potential crash bug when trying to display panels for a plane with a body and an LLT type polar


xflr5 v6.42 May 19th, 2018
    - restored the option in Windows and linux to launch the app by opening a project.xfl, polar.plr, or foil.dat file
    - corrected a bug which prevented the reference dimensions of an analysis to be updated when the geometry
      is modified by the user
    - moved the XFoil and plane analysis modules in separate shared libraries for future re-use
    - fix for bug report #114; as a fallback also added an option to enable/disable the clip plane in the 3d display options.
    - fixed a bag crash bug when typing a number 6+ to request the display of an inexistent graph
    - fixed the display of shortcuts in the menu for MacOS


xflr5 v6.41 April 22, 2018
    - corrected a numerical bug in the calculation of twist for pure vertical surfaces i.e. dihedral=90°;
      would formerly cause a division by zero and lead to inconsistent results
    - corrected a precision issue in the estimation of wing inertia which could lead to underestimation of the total volume.
    - corrected the color scale of panel forces in the 3d view; was proportional to q.S.Cp instead of q.Cp
    - added an option to import/export wings to xml format
    - corrected the export of flat panel bodies to STL to avoid null triangles
    - raised the max cumulated number of span stations from 250 to 1000 for a plane
    - code cleaning


xflr5 v6.40 January 7th, 2018
    - fixed a bug which caused a stability analysis to calculate the operating point with the aoa
    of the previous calculation. negligeable impact on results
    - corrected a potential crash bug when trying to display 3D results of an LLT calculation
    - removed the default suffix "-proj_area" from the name of plane polars
    - restored the output of non-dimensional control derivatives in the operating point properties
    - restored the option to export BL data to text files
    - restored the option to enable or disable autosave which was always turned on
    - included the missing NURBS degrees in the serialization of the body objects
    - added a protection to the max degree of NURBS vs. point count
    - code cleaning


xflr5 v6.39 September 14th, 2017
    - Improved the GUI for the plot of BL results in the XFoil Direct Analysis module; corrected a few bugs at the same time
    - modified the calculation of the lift coefficient at each span station in VLM and Panel Analysis.
      Is now F.dot(SurfaceNormal)/q.S instead of F.dot(WindNormal)/q.S formerly. Increases slightly the viscous drag
      and the viscous moments as a side effect.
    - implemented a more robust process to save the project files
    - disabled the Neumann boundary condition for the 3d panel method
    - removed the extra 180/PI factor in the calculation of stability time response to initial conditions


xflr5 v6.38 June 5th, 2017
    - fixed the random behaviour bug in the OpenGL view


xflr5 v6.37 May 28th, 2017
    - added a verification of the OpenGL version at startup
    - fixed two bad crash bugs when derotating a foil and when defining a flap


xflr5 v6.36 May 22nd, 2017 - limited release only


xflr5 v6.35 May 15th, 2017
    - Added an option to adjust the number of worker threads in a foil multithreaded analysis
    - Fixed some memory leak & overflow issues in foil analysis; improves the stability of the analysis
    - Fixed some font issues for MacOS
    - Other minor improvements


xflr5 v6.34 April 15th, 2017 - limited release only
    - Forced the default renderer to be OpenGL and not Angle on Windows desktops
    - Added an option to export time graphs to text files


xflr5 v6.33 March 26th, 2017
    - corrected the calculation of the downwash and induced angle for the VLM method. Was twice what it should be. No impact on other results.
    - corrected the calculation of the damping ratio; was formerly lambda.real()/omega_damped instead of lambda.real()/omega_natural
    - changed the calculation method of Stability derivatives from forward differences to centered differences.
      The only noticable difference is for Xw which changes significantly. However this derivative seems to have low influence
      on the eigenvalues, and the flight modes should be almost unchanged.
    - modified the construction of wings with dihedral and tilt - minor effect on results
    - improved the wing sweep scaling
    - reorganized the library structure; the XFoil library is now limited to the XFoil class
    - bug corrections and minor enhancements


xflr5 v6.32 January 8th, 2017
    - bug corrections and improvements to the xfoil direct analysis module


xflr5 v6.31 January 6th, 2017 - Not Released
    - added a "light theme" option
    - corrected the calculation of the tail volume when the main wing is not located at the origin;            
      note that the tail volume value is not used in the calculation, it is only provided for information.
    - allowed multiple import and export of Planes and Analysis objects from text and xml files
    - moved the execution of LLT and Panel Analysis to separate threads
    - set the default reference area for plane analysis to the projected area on the x-y plane
    - bug corrections and minor enhancements


xflr5 v6.30 November 6th, 2016
    - updated the license from GPL v2 to v3
    - separated the GUI from the analysis engines
    - added an option to hide flap moments in the operating view
    - added a style property for foil points
    - corrected and improved the calculation and display of analysis with sideslip; impact on results
    - code cleaning
    - bug corrections and minor enhancements


xflr5 v6.14 May 29th, 2016
    - modified the calculation of stability derivatives to take into account viscous drag and extra drag
    - added mass and CoG position to the list of variables for stability polar graphs
    - corrected issues in the construction of wings with inverse dihedral
    - corrected an error in the calculation of a mode's damped natural frequency
    - made some adjustments to batch analysis of foils to speed up execution
    - added some animations to the 3d view transitions
    - removed the limitations inconsistent with the GPL in the credits window
    - fixed a few minor bugs


xflr5 v6.13 April 16th, 2016
    - upgraded to OpenGL 3.0+ from the deprecated OpenGL 1.0
    - improved the lighting options in 3D view
    - improved text rendering on high-DPI (Retina) displays
    - added an option to paint textures on the plane's surfaces
    - added an option to export 3D object geometries to binary stl format
    - added an option to autosave the project at regular time intervals
    - added XCp.Cl as a variable to the plane's polar graphs, and d(XCp.cl)/dCl = XNP to the plane's legend
    - changed the panel force display to q.Cp instead of q.S.panel_area; this is more significant since the arrow lengths are now mesh independent.
    - added the extra drag in the calculation of the plane's total drag coefficient
    - fixed the crash bug when running a multithreaded batch foil analysis
    - fixed the issue of slow display in XInverse design
    - fixed some stability issues in XInverse design
    - interface improvements in XInverse design
    - added a selection option for inertia units
    - changed the display in the foil OpPoint view so that the foil can be overlayed on the graph
    - code cleaning



xflr5 v6.12 January 9th, 2016
    - introduced an option to add extra drag to polar objects, to account for surfaces not included in the plane object
    - restored the plot and export options of the boundary layer graphs after a converged xfoil analysis
    - modified in depth the constuction of the wing geometry, to better account for flap with large deflections; has an impact on results;
    - corrected bugs in the import/export operation of body objects to xml files
    - enabled the LE points of the spline foil to be dragged in Direct Design
    - corrected a minor error in the construction of the foil's mid camber line; potential small impact on VLM results
    - corrected other minor things


xflr5 v6.11 August 8th, 2015
    - added an option to customize the target lift distribution curve in the wing's operating point view
    - added inertia data as parameters in stability analysis
    - added more display options for curve points
    - replaced the deprecated QGLWidget by the new QOpenGLWidget recommended in Qt5.4
    - added a new editor for the plane object
    - added a new editor for the body object
    - reviewed in depth the 2D rendering system to separate viewing operations from the analysis part
    - replaced the rendertext methods in OpenGL by custom implementations to improve the rendering quality
    - improved the issue of the plane-fin intersection when the body is translated
    - enabled launching xflr5 from a project file, and opening the model
    - added an import/export option of a plane definition to an xml file
    - added an import/export option for body objects to an xml file
    - deeeeep code cleaning
    - other minor corrections and improvements


xflr5 v6.10.04 April 12th, 2015
    - Corrected a potential crash bug when deleting a plane with polars
    - Added a standard ISA model for the calculation of air properties
    - Corrected the issues with the reference lengths after wing scaling
    - Fixed the bugs related to the import operation of a body definition from a text file
    - Fix for retina displays on OS X
    - Corrected the export of plane polars to text files to include the sideslip variable
    - Other minor corrections and improvements



xflr5 v6.10.03 April 13th, 2014
    - Corrected the incorrect calculation of the mid camber line of foil with flaps
    - Corrected the crash bug when calculating a wing with flaps using the LLT method
    - Corrected the crash bug when deleting foils from the manage dialog box


xflr5 v6.10.02 March 21st, 2014
    - Added an option to scale the wing's area and aspect ratio
    - Fixed a potential crash bug in Graph scales drawing when no project is loaded
    - Improved the support for OpenGL on Windows platforms
    - Changed the calculation of satbility derivatives to be always invsicid - no noticeable impact on results
    - Modified the calculation of the foil mid line and wing mid surface - reduces issues with foils with coarse panelling at leading edge
    - Added and option to display panel normals and vortices - meant to help check if foil panelling is fine enough
    - Added an option to set manually the reference dimensions for the calculation of aerodynamic coefficients of planes
    - Fixed the issue with the storage of modified foils in inverse design
    - Fixed the issue of ineffective a.o.a. increment in Batch Foil Analysis
    - Fixed the bug which caused the flap moment not to be reset at each plane calculation
    - Other minor cosmetic changes


xflr5 v6.10.01 February 1st, 2014
    - Created a new binary .xfl projet file format. Replaces once and for all the awful .wpa format
    - Removed the option for independent wing analysis
    - Introducing type 5 polars for the analysis of variable sideslip
    - Disabled the horseshoe vortex method for stability polars, for beta-polars, and whenever sidelip is defined.
    - Aligned  theviscous drag vector with freestream velocity rather than with x-axis - slight impact on viscous results
    - Enabled LLT analysis for all Plane objects
    - Removed the option for symmetry in 3d analysis
    - Corrected the bug in type 4 plane analysis- elevator and fin coefficients were incorrectly calculated
    - Removed the default sizing for panel and matrix arrays. The arrays are now allocated for the size of the largest model loaded in the session.
    - Corrected some memory leaks
    - Corrected memory allocation/release mismatches
    - MASSIVE code cleaning.
    - Created GUI-independant classes for 3D-panel analysis and LLT analysis
    - Minor corrections and enhancements


xflr5 v6.09.06, December 7th, 2013
    - introduced number input/ouput using system locale settings.
    - mesh resizing is now enabled without any limit other than the one set by the compiler and the system
    - fixed the issues with the animation of foil operating points
    - removed the option to save as a file for xflr5 v5 or v4 - no point and source of bugs
    - corrected the automatic polar name of foils in multithreaded analysis
    - added import/export of the wing geometry via plain-text files
    - fixed the bug which caused the pitching moment to be zero
    - solved most (all?) of the issues with OpenGL text rendering
    - improved the default stylesheet
    - fixed the translation issues
    - made the code compatible with msvc nmake
    - removed the access to the array of body objects; bodies are now objects attached to a single plane
    - deep code cleaning
    - other minor corrections and enhancements


xflr5 v6.09.05 beta, March 20th, 2013
    - Modified the project load method to keep the data even for corrupted files
    - Other minor enhancements



xflr5 v6.09.04 Release candidate, March 2nd, 2013
    - Added optional stylesheets for application toolbars
    - Added a feature to reset a wing section to interpolated values between two adjacent sections
    - Fixed a few bugs
    - Made some other minor enhancements


xflr5 v6.09.03 Beta, January 5th, 2013
    - Added an option in the polar definition dialog to ignore the body in the plane analysis
    - Corrected the bug which created straight streamlines after a failed analysis
    - Corrected a crash bug in plane inertia definition
    - Corrected the automatic polar name for foils
    - Corrected the bugs in body edition
    - Corrected loading issues of old files
    - Restored the max number of points in a plane calculation to 100, with correspondig increase in memory usage
    - More code cleaning

xflr5 v6.09.02 Beta, January xxxth, 2012
    - Not released


xflr5 v6.09.01 Beta, November 18th, 2012
    - Modified the wing twist definition which is now applied around the panel's quarter chord rather than around the y-axis. Impact on results.
    - Corrected the bugs in body edition
    - Fixed a few crash bugs
    - Minor enhancements
    - Made a lot of code cleaning



xflr5 v6.08, October 24th, 2012
    - corrected the scaling of foil thickness and camber
    - corrected the incorrect foil automatic polar name
    - corrected the issue with zero-length wing sections
    - corrected the occasional crash bug in plane definition with elevators
    - minor bug corrections and enhancements



xflr5 v6.07, June 28th, 2012
    - fixed type 2 batch polar analysis
    - fixed the issue with incorrect 3D-panel calculations
    - Corrected the incorrect aileron control derivatives
    - Corrected the bug in wing analysis with ground effect
    - Corrected the bug in type 4 analysis for wings and planes
    - Corrected the bug which modified the chord length as twist increases : impact results for wings with high dihedral
    - Cleaned, corrected, and improved the code for B-Splines
    - Removed the option for Min/Max type controls in Stabillity Polars
    - Added an option to edit Wing Polar paramaters
    - Fixed the crash bug when defining wings with more than 16 span sections
    - Corrected a bug leading to incorrect results in stability derivatives with active controls (CPanel::RotateBC())
    - Removed the Splined Points Foil option
    - Other minor corrections and enhancements
    - Code cleaning


xflr5 v6.06, January 28th, 2012
    - changed and hopefully improved the algorithm which intersects wing surfaces and body
    - code cleaning
    - minor bug corrections and enhancements
    - reduced the maximum size of sections, masses, and chorwise panels on a wing to reduce global memory usage



xflr5 v6.05 beta, July 24th, 2011
    - For Type 7 polars, listed the control value instead of the aoa in the top drop down box
    - Added a calculation form to determine Re.sqrt(Cl) for foil Type 2 polars
    - Added the Japanese translation to the repository - thanks to Koichi
    - Minor corrections and improvements


xflr5 v6.04 beta, May 14th, 2011
    - added a settings save at each project save
    - added and option to view forces on panels as coloured arrows
    - fixed the incorrect setting of AVL-type controls for flaps in T7 analysis
    - added the missing write operation in the project file of the control variable for wing operating points
    - modified the setting of boundary conditions in T7 analysis with activated controls - impact on balanced aoa
    - modified the wing construction process to allow for a gap in the middle of the wing
    - corrected the bug which caused the disapperance of the left stability toolbar when switching to 3D view
    - corrected the bug which prevented from changing the default number of panels in naca foil generation
    - continued the code cleaning process



xflr5 v6.03 February 13th, 2011
    - modified the geometry connection between panels with dihedral and twist - may slightly impact the results
    - corrected the calculations with sideslip
    - added multi-threading capability for foil batch analysis
    - added an option to display the position of point masses in 3d-view
    - in the export to AVL of point masses, corrected the missing addition of wing x & z position
    - modified the export format to AVL of with wing flaps
    - added an option to highlight the currently selected operating point, or the mode in root locs view
    - changed the interface for stability analysis
    - added a properties dialog box option for operating points
    - corrected various minor bugs
    - made several minor enhancements



xflr5 v6.02 Beta December 19th, 2010
    - added an option to load a background image in the foil direct design module
    - corrected some errors in CoG and inertia automatic calculations, with impact on results
    - did some deep code cleaning
    - re-organized the panel analysis code to perform only one far field calculation per operating point
    - optimized the panel method for increased speed of execution
    - corrected the mesh edition for NURBS bodies
    - changed the export format for graphs
    - implemented the stability method for mixed panel/vlm method
    - implemented the stability method for full 3D panel method
    - corrected the bug which lead to incorrect results in 3D panel with Neumann B.C.
    - corrected the error in the jump in potential at the wing's trailing edage in full 3d panel method
    - set the estimation of inertia properties at the time of polar definition instead of evaluating at the time of analysis
    - fixed the bug which could cause a crash when dragging a point in splines design
    - corrected the asymetric transition location for symetric wings
    - corrected the source strength influence of thick panels on thin surfaces, with impact on results for planes with body
    - corrected the Cp 3D color display for VLM2 analysis
    - added the influence of pressure forces acting on the body to induced pitching moment coefficient
    - added calculation of neutral point position based on Cma/Cza ratio
    - corrected various minor bugs
    - made several minor enhancements


xflr5 v6.01 Beta October 14th, 2010
    - Corrected the incorrect balance speed in 3D type 2 polars for planes
    - Corrected the final moment calculation in stability analysis
    - Corrected the incorrect lift calculation in stability analysis


xflr5 v6.00 Beta September 19th, 2010
    - added Stability and control analysis
    - changed the 3D-panel method for planes from full 3D to mixed thin/thick surfaces
    - doubled the maximum acceptable size for mesh definitions, i.e;. new value is 5000 panels max.
    - added an option to run polar batch calculations on a list of airfoils
    - refined the inertia evaluation for wings by considering mass distribution in the spanwise direction
    - changed the foil list table in XDirect
    - corrected the display bug for stippled lines in 3D view
    - added an option to reverse the zoom direction with the mouse wheel
    - made some code cleaning in VLM and 3D-Panel analysis


XFLR5 v5.00 April 11th, 2010
    - changed the executable target name from QFLR5 to xflr5
    - changed and reorganized drastically the file system
    - changed the icon images from Q5 to X5
    - changed the unix directory for translated files to /usr/share/translations
    - added the spec file for the creation of rpm packages
    - corrected the bugs linked to undo/redo of spline modifications in direct design
    - corrected a bug linked to a potential incorrect type in WPolar Dlg
    - correctd the option to save in v4.00 format
    - made some code optimization for increased speed
    - made other minor improvements and corrections


QFLR5 v0.04 Beta December 27th 2009
    - Replaced the confusing term XCmRef by CoG; added z-position for CoG
    - Added some signal connections for wing control polars 
    - Declared a bunch of local variables as static to speed things up by preventing repetitive memory allocations
    - Corrected the bug associated with tilted geometry calculations
    - Corrected an error in the calculation of downwash for secondary wings and fins - main wing was OK
    - Improved the 3D view of lift and drag for results with sideslip
    - Fixed the issues with animation in Miarex
    - Fixed the issue with 3d Cp scale settings
    - Corrected a bug in the estimation of the CoG for wings
    - Corrected incorrect summation of a plane's inertia components
    - Forced the use of QPaintEngine::OpenGL, which seems to fix the font display issue
    - Corrected a crash bug when selecting splines in Direct Design
    - Corrected a crash bug when capturing the OpenGl view to an image file
    - Adapted the code for Qt4.6.
    - Made a few corrections and enhancements


QFLR5 v0.03b Beta October 28th, 2009
    - Fixed a bug which prevented polars from being stored during a foil batch analysis


QFLR5 v0.03 Beta October 25th, 2009
    - Added a form to evaluate the CoG and inertia of wings and bodies
    - Redefined the pitchnig moment and yawing moments for clarity - details in the guidelines § 5.16
    - Added an option to store oppoints in foil batch analysis
    - Marked more sentences for translation
    - Corrected a crash bug which occurred when trying to run a biplane analysis without an elevator
    - Corrected Tail volume calculation - was missing a PI/180 coefficient ; no impact on results
    - Corrected lift calculation in Type 2 polars. The lift was calculated by two different methods in separate parts of the code leading to incorrect results
    - Corrects bugs related to projected areas for aero coeff calculations
    - Corrected incorrect units in reference length for AVL export


QFLR5 v0.02 Beta September 1st 2009
    - Corrected many bugs
    - Made a few minor enhancements


QFLR5 v0.01 Beta July 4th 2009 - first release
    - QFLR5 is a re-write of XFLR5 using the Qt4 libraries. 
    - The goal is to make the code cross-platform and available for Linux and Mac OS.
    - The current beta version offers 95% of functionnalities available in XFLR5, and does not provide any additional feature except for a different look and feel interface.
    - In the future, only this cross platform version will be supported.
    - Once it has reached a stable state, it will be released as XFLR5 v5.00


v4.17 June 1st, 2009
    - Corrected the bug which prevented the definition of a control polar
    - Corrected the bug which prevented to run a foil Type 1 analysis after having run a type 4 analysis


v4.16 April 13th, 2009
    - Added an option to use the area and span projected on the xy plane for aerodynamic coefficients, instead of the developed planform span and area values
    - In 3D wing analysis, corrected the pitching moment calculation to include the viscous pitching moment generated by the viscous drag when the wing has a z-offset
    - Corrected the bug by which the main wing's position wasn't taken into account in the calculation of a plane's tail volume
    - Also in the tail volume calculation, corrected the confusion between deg and rads which gave false values if the elevator was not in the xy plane
    - Corrected the bug which prevented convergence of foil inviscid analysis the first time
    - Improved the export option for Plane/wing operating points, to enable post-processing of Cp values in a spreadsheet
    - Corrected the bug linked to airfoil duplication which could cause the code to crash
    - made other minor corrections


v4.15 January 24th 2009
    - Corrected a bug in foil Polar for the power factor Cl3/Cd2
    - Corrected a bug which could cause the program to crash in the case of a wing defined with flapped foils, if the foils were deleted
    - Corrected a bug in foil Type 4 polars which could lead to display an incorrect alpha value in the OpPoint view
    - Corrected a minor bug relative to inoperant graph translation in some cases
    - Corrected the bug which prevented to run 3D analysis with step less than alpha or Cl = 0.1


v4.14 December 30th, 2008 (limited release only)



v4.13 December 6th, 2008
    - Corrected a minor bug in Inverse design which prevented a second consecutive application of the spline
    - Corrected a minor bug in the display of bodies imported from text files
    - Set default coresize = 1micrometer minimum both in VLM and Panel methods
    - Switched to Trefftz plane integration for lift force in 3D Panel method --> impact on results
    - Improved the export interface to AVL for planes and wings, including control surfaces
    - Improved the interface for 3D cross section Cp display
    - Added an option to export any graph's curves to a .txt or .csv file
    - Made a few cosmetic improvements
    
v4.12 November 16th, 2008
    - Added options to export/read body definitions to/from simple text files; 
      The file format may be obtained by exporting any body
    - Added an option to export the client area to an image file
    - Fixed issues with file paths while saving
    - Fixed the bug which prevented XFLR5 to launch after a selection of the thumbnail window
    - Set the default parameter for 3D panel wake length to 100 x MAC instead of 1 x MAC
    - Added the x-coordinate to export of current XFoil results
    - Added option for .csv format option for all txt file exports
    - Fixed a rare crash bug when using foil polars with zero content
    - Corrected the bug which prevented to insert a projet in the one currently opened
    - Improved the GUI of the panel list in the wing design dialog

v4.11 November 2nd, 2008
    - Changed the twist/washout application method ; used to be set around y-axis irrespective of dihedral;
      is now set around the panel's quarter chord, once the panel has been rotated by the dihedral angle
    - Improved the foil flap setting algorithm, which generated incorrect geometries in some special cases
    - Corrected a 1/2 missing factor in the output of non converged LLT oppoints - no effect on results
    - 3D panel with tilted geometry : corrected wake tilting
    - Improved streamline display to reduce singularity effects, essentially by enforcing Kutta's condition
    - Changed the algorithm for induced drag calculation in 3D panel analysis - slight difference in results from v4.10
    - Solved the multiple storing issue of identical Opps
    - Corrected a bug which could occasionnaly prevent from reading the saved settings
    - Cleaned up the code
    - Compiled with MSVC 2008 instead of .net

    
v4.10 September 6th, 2008
    - Corrected a minor bug in Control Polars - no influence on results

v4.09 September3rd, 2008 (limited release only)
    - Corrected factor 2.0 in excess in induced angle in VLM analysis
    - Corrected mix up in plane controls when performing a control analysis with multiple flaps
    - Added extra decimals in AVL geometry export
    - Corrected downwash display for planes
    - Corrected factor 2.0 missing in MAC span position
    - Corrected bug when running a single point calculation for 3D panel method - error on results for symetric calculations
    - Refined the Lift calculation in Type 2 Polars; was missing a cos(a.o.a)
    - Made a few cosmetic improvements
    
v4.08 July 20th, 2008
    - Corrected the bug which caused to ignore weight and speed parameters in control polars
    - Forced Dirichlet Boudary Conditions for 3D analysis
    - Corrected a crash bug when loading some project files
    - Added an option to change axis color & style in 3D view

v4.07 July 11th, 2008
    - First release of Type 5 and Type 6 Control Polars for planes
    - Corrected spline foil bug

v4.06 June 25th, 2008
    - Corrected display of OpPoint results in animated 3D view    
    
v4.05 June 23rd, 2008 (limited release only)
    - Improved the Type 5 control analysis polar
    - Corrected incorrect orientation of local panel vector in 3D analysis - snesitive only for very high thickness airfoils
    
v4.04 June 9th, 2008 (limited release only)
    - Corrected the inoperative animation in 3D view

v4.03 June 5th, 2008 (limited release only)
    - Corrected the crash bug for a  number of cumulated span stations greater than 100
    - Corrected the geometrical bug when setting a flap on a foil
    - Changed the De-rotation for the airfoil, to take into account the flap

v4.02 April 6th, 2008
    - Corrected a 1/1.1225 factor missing in XCP calculation in VLM analysis
    - Modified the interpolation method for on-body analysis in 3D panel, to account for special cases with panel numbers less than three in one direction
    - Made a few cosmetic changes to body view
    - Changed the scaling center in body view

v4.01 March 24th, 2008
    - Corrected the omission of the airfoil's contribution to the pitching moment in VLM and 3D-Panel
    - Corrected wing surface normal calculation in case of a zero-length panel
    - Changed the scaling center in 3D view

v4.00 March 16th, 2008
    - Introduced the 3D-Panel Method
    - Redefined the moment coefficients - see the guidelines for details
    - Corrected a sign error in geometric yawing moment in VLM analysis
    - Changed the fin definition : all planes with fins will need to be redefined...
    - Changed 3D view rotation with arcball
    - Corrected an error in Ground effect in VLM
    - Added Reflected curve display in XInverse
    - Added Slope tangency constraint on spline in XInverse
    - Inverted Cp signs in VLM 3D Delta_Cp display
    - Added option to offset the main wing in a plane design
    - Corrected the area of double fins or symetrical fins : factor 2 had been ommitted
    - Corrected occasional crash bug when deleting all Opps associated to a Wing or Plane Polar
    - Corrected chord calculations when there is a gap in the middle of the wing
    - Corrected a potential crash bug when loading a project file which includes a plane object
    - Added a save check before loading a file from the recent file menu
    - Modified the panel Normal definition as a necessary step for 3d panel methods. VLM results are slightly modified for twisted surfaces.
    - Changed X-View in 3D display to view the plane from the rear
    - Corrected MAC span position calculation
    - Corrected mid line inversion bug in Splined Points App
    - Corrected "Reset Default" values in LLT/VLM advanced setttings, to set default vortex core size at 0.1mm
    - Corrected potential file write error at the end of Foil, LLT, or VLM analysis
    - Corrected minor bug in the panel VLM creation routine which could define a non-trailing panel as trailing ; no impact on results
    - Corrected other minor cosmetic bugs
    
v3.21e June 17th,2007
    Trouble with internal messaging issues :
    -     Deleted all V/W_ENDTHREAD messages, replaced them with idle loop checking for end of analysis
    
v3.21d June 6th,2007
    Trouble with internal messaging issues :
    -     Removed autoclose of dialog box in XDirect single analysis

v3.21c June 2nd,2007
    Trouble with internal messaging issues :
    - Restored the  V_ENDTHREAD and W_ENDTHREAD parameters and changed them to WM_APP+1

v3.21b June 2nd,2007
    Trouble with internal messaging issues :
    - Deleted V_ and W_ENDTHREAD parameters and replaced them by EndDialog(0) messages

v3.21a May xxxth,2007
    Improved some cosmetic aspects

v3.21_Beta May 27th,2007
    Added tentative volume calculations to plane and wing definitions
    
v3.20 May 4th,2007
    Introduced a Biplane option in wing analysis
    Corrected the tail volume calculation for V-Tails
    Introduced an option to edit spline ctrl points coordinates
    Released the constraint on spline leading and trailing points to allow their translation
    Added Recent File management
    Removed the foil's automatic length normalization : operation will need to be performed manually
    Corrected the initialization of the Inverse Design to take into account the latest foil loaded in XFoil
    Introduced Moment display in the Wing 3D view
    Corrected a few minor cosmetic bugs
    

v3.19 March 31st, 2007 - First release at SourceForge.net
    Corrected cosmetic bugs
    Add an option to export panel geometry and Cp values
    

v3.18 March 24th, 2007 (limited release only)
    Corrected bugs related to the units change
    Changed the bending moment calculation for negative values
    Added an option to hide the text output in XFoil BatchDialog
    Corrected a few more cosmetic bugs


v3.17 March 18th, 2007 (limited release only)
    Added option for ground effect in VLM Analysis
    Added option to remove the Cp graph in XFoil analysis
    Changed internal units to I.S.
    Modified the ligth & shading settings in 3D wing display


v3.16 March 8th, 2007 (limited release only)
    Corrected the bug which limited the number of points to 271
    Added option to read foil files with no foil names, or with points in reverse order
    Corrected the foil normalization process
    Added an option to export current xfoil results to file
    Added HMom calculation in XFoil
    Modified the meshing process for wing panel with flaps, to accomodate the break at hinge location
    Added reference curve display in Inverse Design to enable foil comparisons


v3.15 January 21st, 2007
    Made a few enhancements and cosmetic improvements


v3.14_JM4 January 16th, 2007 (limited release only)
    Corrected the bending moment calculation - was calculated in absolute value along span (impact on results)
    Corrected a few minor bugs


v3.13_JM3 January 14th, 2007 (limited release only)
    Changed the title of the incorrectly named static margin for wing polars
    Changed the pitching and yawing moment calculation for planes with elevators and fins (impact on results)
    Corrected a few minor bugs

v3.12_JM2 January 09th, 2007 (limited release only)
    Reduced the max number of wing panels to 30 instead of 100 to reduce loading times and memory usage
    Added XCp export for foil polars
    In LLT, changed XCp calculation to interpolation of XFoil polars
    Corrected the bug which created a double operating point for foils at alpha=0
    
v3.11 Not released
    Modified the streamlines drawing process for supposedly smoother streamlines
    Changed the position of the wake vortex in VLM2 - very minor impact on results

v3.10 January 5th, 2007 (limited release only)
    Corrected crash bug when importing XFoil or Javafoil polar
    In Batch Analysis, increased the text limit in the output window

v3.09 December 23rd, 2006 (limited release only)
    Added option to perform inviscid VLM Analysis
    Made a few enhancements and cosmetic improvements

v3.08 November 19th, 2006 (public release)
    Modified foil management interface in Direct Design
    Deleted Auto VLM mesh interface
    Corrected Drag scale 3D-display for panels with high dihedral
    Corrected printing bug for dashed and dotted lines
    
v3.07 November 14th, 2006 (limited release only)
    Changed Cp 3D-display option to show lift component normal to the panel rather than the vertical component of lift

v3.06 November 13th, 2006 (limited release only)
    Corrected visual display of fin lift (was using fin area as ref area instead of using wing area); Good observation Marc !!

v3.05 November 12th, 2006 (limited release only)
    Added XCp in Xfoil polar graph variables
    Added L.E. Flap option
    Corrected panel interferences in flap option 
    In wing local lift and local drag calculation, changed the erroneous c.cl/mean geom. chord to c.cl/m.a.c.
    Corrected minor bugs
    Made several minor cosmetic improvements
    
v3.04 October 22nd, 2006 (limited release only)
    Change the order of twist and dihedral application in wing construction, with impact on results for wings with high dihedral such as winglets
    Changed Direct Design presentation to facilitate foil comparisons
    Changed wing construction panel

v3.03 October 16th, 2006 (limited release only)
    Added Opp Point display on the Wing Opp model
    Corrected bug for plane calculations with wing panels less than critical size
    Added import routine for javafoil-generated polars
    Modified the automatic mesh method for wings to increase panels at wing tip
    Made several minor cosmetic improvements

v3.02 October 7th, 2006 (limited release only)
    Added light options for 3D views
    Modified double fin option to make fins reflected rather than identical
    Added analysis parameters to .set file
    Added option to set minimum wing panel legnth to be taken into account in analysis
    Corrected minor memory leak in XFoil analysis

v3.01 September 24th,2006
    Corrected a major bug impacting results when calculating a Plane with the VLM-Quad method ; the consequence was a double count of the elevator's lift
    Added stream lines display
    Added option to perform VLM on tilted geometry
    Added tilt angle for fins
    Added length unit conversions to plane definition Dialog box
    Minor cosmetic modification

v3.00 September 7th,2006
    Made several minor improvements
    Corrected crash bug in 3D view when foil is deleted
    Corrected Total Pitching Moment minor bug in Wing Polar
    
v2.99 Beta 014 July 23rd,2006
    Introduced Induced and Viscous Drag 3D visualisations

v2.99 Beta 013 June 24th,2006
    Corrected viscous drag calculation for planes
    
v2.99 Beta 012 June 15th,2006
    Introduced again wake rollup
    Corrected memory overflow in VLM ICd calculation
    Corrected a few more bugs
    
v2.99 Beta 011 June 4th,2006
    Corrected crash bug when loading a foil with an existing name
    Corrected rename & duplicate wing bugs

v2.99 Beta 010 May 28th,2006
    Corrected a few bugs

v2.99 Beta 009 May 20th,2006
    Corrected wing Type 4 analysis sequence loop
    Corrected WOpp deletion bug
    Made a few imporvements to printing options

v2.99 Beta 008 May 20th,2006
    Corrected Type 4 analysis

v2.99 Beta 007 May 20th,2006
    Corrected a few bugs relative to operating points saving and deletion

v2.99 Beta 006 May 19th,2006
    Corrected a few bugs and made a few improvements suggested by Jean-Marc
    
v2.99 Beta 005 May 18th,2006
    Corrected minor bugs
    Reduced downwash scale
    
v2.99 Beta 004 May 13th,2006  (Limited release only)
    Used wing area as reference for all plane coefficients (CL, CD, etc)
    Made multiple minor code corrections
    Introduced double fins
    Removed Cp calculations and graphs    (was useless)
    Modified 3D surface representations with minor impact on non planar wing VLM results

v2.99 Beta 003 March 23rd,2006
    Introduced Cp Graphs for VLM analysis
    Corrected minor memory overspill in Inverse Design

v2.99 Beta 002 March 12th,2006
    Modified Cp calculations for Top & Botton VLM

v2.99 Beta 001 March 6th,2006 
    Introducing plane design and analysis
    Modified the wing's geometry generation at combinations of high twist and high dihedral (VLM only)
    Re-wrote the VLM algorithms in depth with slight impact on results 
    Introduced Quad VLM Method

v2.05 January 28th ,2006  (Limited release only)
    Corrected a minor VLM Polar Interpolation bug (no effect on results)
    Changed the interpolation method of twist between root and tip chord (VLM only)
    Introduced alphabetical sorting of wings and polars
    
v2.04 January 27th ,2006  (Limited release only)
    Improved the sorting of wings and polars

v2.03 January 24th ,2006  (Limited release only)
    Recompiled with VisualC++.net

v2.02 December 11th,2005  (Limited release only)
    Made a few cosmetic improvements
    Improved printing options
    Improved code ergonomy

v2.01 November 7th,2005 
    Reverted to Trefftz plane analysis for induced drag calculations. 
    cf. Guidelines Rev. �5-4-2 for detailed explanations.

v2.006 November xxxth,2005 (Limited release only)
    Added NCrit parameter in Batch Analysis from list
    Fixed the EndAnalysis bug while moving window

v2.005 October 26th,2005 (Limited release only)
    Corrected error in Airfoil Pitching Moment calculation in VLM analysis (OpPoint only... Value in polars is correct)
    Added automatic generation of 4 & 5 digits NACA foils
    Added VPlot capabilities for last XFoil Direct Analysis
    Added option for batch calculation from Reynolds list
    Added option to start batch calculations from alpha=0 to improve convergences
    Added memorizing of Alpha for each polar in Wing Analysis (Special for Marc)
    Corrected spline commands in XInverse
    Corrected sweep and twist scaling bug in Wing design/Scale Wing
    Solved a few more minor bugs (no impact on results)
    Made a few cosmetic improvements


v2.00 September 29th,2005
    Official release


v1.99v035 September 24th,2005
    Cancelled loading of WOpp results in WPolars when loading a projet
    Corrected interpolation process for OutPoints in VLM
    Changed Rename process for Polars and WPolars
    Separated chord and span scaling in WingScale dialog


v1.99v034 August 31st,2005
    Virtually identical to v33


v1.99v033 August 28th,2005
    Re-transferred transitions to the WPolar's definition !
    Implemented re-initialization of LLT after unconverged iterations
    In VLM, added Cm and XCp calc based on forces rather than on thin airfoil theory
    Corrected VLM panel save in wpa file
    Suppressed common foil constraint at wing's plane of symmetry
    Corrected many more bugs


v1.99v032 July 14th,2005
    Corrected minor bug in 3D view


v1.99v031 July 6th,2005
    Added legend to 3D view
    Added twist to 3D view
    Converted all floats to doubles to accelerate computations since C works with double precision
        

v1.99v030 June 23,2005
    Corrected crash bug in foil polar view


v1.99v029 June 22,2005
    First test of double precision calculations
    Added legend to 3D view


v1.99v028 June 8,2005
    Separated flap from transition parameters
        

v1.99v027  June 1st,2005
    Last batch of minor bugs
    Fixed the extended status bar bug


v1.99v026  May 26th,2005
    Introduced Y-Zoom in BSpline app
    Introduced Animation in wing design
    Improved print capability, including B&W option


v1.99v025  May 12th,2005
    Corrected resource leaks and other bugs


v1.99v024  April 30th,2005
    Last round of corrections & improvements before relase of V2.00 ?


v1.99v023  April 22nd,2005
    Corrected foil flap bug on interpolated bugs


v1.99v022  April xxx,2005
    Corrected minor bugs


v1.99v021  April 2nd,2005
    Added 3D View


v1.99v020  March 20th,2005 - releasable as v2.00
    Corrected again PCd VLM calculation


v1.99v019  March 18,2005 
    Minor improvements


v1.99v018  March 18,2005
    Added import/export of AVL format
    Added bending moment calcuation
    Corrected PCd VLM calculation


v1.99v017  March 5,2005
    Reset graph defaults in wing design
    Added bending moment calculation


v1.99v016  February 26th,2005
    Added automatic VLM mesh on insert/delete panel
    Corrected a few more bugs


v1.99v015  February 20th,2005
    Reverted to Induced drag calculation by surface force integration rather tha in the Trefftz plane
    Corrected ClSpec bug in foil batch analyis
    Made minor enhancements and modifications


v1.99v014  February 17th,2005
    Beta version released for testing


v1.99v013  February 14th,2005
    Introduced severals cosmetic refinements
    Developed new options for VLM calculation
    Changed VLM Induced Drag calculation to Treffz plane
    Added optimal elliptic wing loading display


v1.99v012  January 30th,2005
    Corrected duplicate wing bug


v1.99v011  January 26th,2005
    Corrected induced drag calculation for VLM


v1.99v010  January 23th,2005
    Introduced several mods and corrections required by users
    Introduced VLM Calculation


v1.99v009  December xxxth,2004
    Introduced automatic discard of unconverged WOpPoints, and re-initializationa after divergences


v1.99v008  December xxxth,2004
    Corrected another batch of bugs !


v1.99v007  December 17th,2004
    Corrected a first batch of bugs, including moment calculations


v1.99v006  December 10th,2004
    Incorporated Miarex v006 to XFLR5
    Reengineered code based on MainFrame/View architecture


v1.25 November 6th,2004
    Increased general code robustness (hopefully...)
    Fixed "Show Points" crash bug
    Fixed "Init Boundary Layer" crash bug in Batch Dialog
    Fixed "On Sequence" crash bug when no foil is loaded
    Added power factor for negative Cl values : -|Cl|^(3/2)/Cd
    Added 1/sqrt(Cl) to the polar graph variables, Cl>0
    Added "Keep curve" option in Cp Graph
    Made more minor enhancements and corrections


v1.24 September 1st,2004
    Enabled Re input higher than 1 million
    Added Cd x 10000 variable for Polar graphs
    Added polar type filter for display


v1.23 July 1st,2004
    Introduced Type 4 polars : fixed Alpha, variable Re
    Increased polar format to "4" for storage of Type 4 polars
    Made minor enhancements and corrections


v1.22    June 9th,2004
    Suppressed the idle loop which generated unnecessary processor utilization
    Corrected export bug from Mixed inverse
    Corrected bugs linked to mouse position and context menus


v1.21    May 28th,2004
    Redirected all file openings from within the Explorer to the first instance of XFLR5, if any is already running
    Added option to set BL and pressure distribution styles
    Fixed Export OpPoint bug
    Removed Cl^3/Cd^2 from graph variables (apparently a confusion with the power factor Cl^(3/2)/Cd)
    Made minor enhancements and corrections


v1.20    May 9th,2004
    Moved Foil and Polar selection to toolbar
    Fixed crash in initial inviscid analysis (Thanks Windsurfer)
    Fixed result display bugs in inviscid analysis
    Authorized sequence analysis for decreasing Cls and Alphas
    Added two polar graphs view
    Added option to define variables in all graphs
    Added Cl/Cd, Cl^(3/2) / Cd and Cl^3 / Cd^2 in graph variables
    Added inviscid result to OpPoint, even if viscous analysis is unconverged
    Added IterationBlocks and Iteration Limit to ".def" files and to settings file
    Added automatic geometry normalization on load of foil
    Resized wake arrays in OpPoint
    Added option to skip OpPoints storage and to keep only polar data
    Made minor enhancements and corrections


v1.17    April 18th,2004
    Solved Graph scale bug when dragging and zooming
    Solved Smooth() bug in Mixed Inverse design (Thanks Windsurfer)
    Solved crash problem when visualising Polars
    Solved Cancel Analysis bug in batch analysis
    Added minor grid in Direct Design
    Improved RenameFoil dlg box behaviour
    Made minor enhancements and corrections


v1.16    March 26th,2004
    Solved Bug in Animate() which mixed �ppoints from different foils
    Resized arrays in Direct Design 
    Corrected and improved scaling of Foils' thickness and camber
    Made minor enhancements and corrections
    Solved more bugs


v1.15    March 15th,2004
    Added batch analysis capability
    Added Direct design from splined curves
    Added interpolation of foils
    Added Camber and thickness scaling of foils
    Added zoom capability on foil in Inverse Design
    Added zoom cursor both in main dialog and in Direct and Inverse Design zoom
    Added zoom from middle button down and vertical mouse movement
    Modified Camber & Thickness calculations 
    Limited all drawings to dc's bitmap sizes
    Corrected Grid bug drawing in Direct Design
    Made minor enhancements and corrections


v1.14    February 27th, 2004 
    Suppressed CSytemsDependencies which may be the cause of conflict on some operating systems
    
    
v1.13    February 26th, 2004 
    Added Grid option in Direct Design
    Corrected resource leak in Animate()
    Added DeleteObject() in all graphics interfaces
    Corrected initial degree display in Direct design
    Removed double points in polar objects
    Changed polar format to "3" for showpoints toggle
    Made minor enhancements and corrections


v1.12    February 08, 2004 
    Added automatic load of buffer foils in Direct Design
    Added zoom & drag capability in all graphs using mouse button & wheel
    Associated ".plr" files to XFLR5
    Associated ".opp" files to XFLR5
    Associated ".dat" files to XFLR5
    Made minor enhancements and corrections


v1.11    February 2nd, 2004 
    Made minor enhancements and corrections


v1.10    February 1st, 2004 
    Implemented Full  Inverse Design routine (MDES)
    Implemented Mixed Inverse Design routine (QDES)
    Made minor enhancements and corrections
    

v1.00    February 2nd, 2004 - First release of non-beta version
    Added Q Graph in analysis
    Added Q serialization in OpPoints
    Made minor enhancements and corrections


v0.36    January 13th, 2004
    Added X axis control in CPGraphOptions
    Added minor grid option for graphs
    Added half-point lines options
    Made minor enhancements to design module


v0.35    January 10th, 2004
    Resized controls to fit 800x600 screens
    Defined macro parameters for XFoil arrays
    Resized snew[4*IBX], isys[IVX][ISX], qinvu[IZX][3], in  xdirect/XFoil.h
    Resized usav[IVX+1][ISX] in XFoil::setbl()
    Added Grid option for graphs
    Added single polar graph option
    Corrected print bug in design module
    Added "Undo" option in design module


v0.34    December 26th, 2003
    Corrected ipan/va/vb/vz/vm/vdel array sizing bug in xdirect/XFoil.h
    Corrected qnew and q_ac array sizing bug in Xfoil::update()
    Forced 'Apply' request when exiting PANE menu
    Added recognition of '#' comment character in Foil files
    Added View Log File Menu
    Added 'Foil Menu' with option to rename/delete foils
    Corrected more minor bugs / made minor enhancements

v0.33    December 23rd, 2003
    Redirected XFoil message report to "XFLR5.log" file rather than to CRichEditCtrl because of potential incompatibility with Windows 2000 and older windows systems.
    Added Automatic polar name option
    Modified the design interface in depth 
    Added color/width/style save for "plr" files - changed format to "2"
    Solved bug related to change of output points number in deisgn module


v0.32    December 20th, 2003
    Added Xfoil Advanced settings control
    Added XFoil message report
    Solved RDEF bug
    Solved Boundary layer print bug
    Solved Legend print bug on Cp graph
    Solved PANE and CADD bugs and changed appearance
    Solved Design failure bug after 2 loads
    Solved Double-click bug in Design Module
    Changed "Set Analysis" behaviour so that parameters are kept from one setting to another
    Grouped all polar commands in a single dialog box
    Added automatic load of settings at start-up and save on exit
    Solved yet more bugs !

v0.31    December 14, 2003
    Solved bug linked to PANEL command
    Solved bug linked to Clspec/Alphaspec toggle
    Solved various bugs

v0.30    December 10, 2003
    Added option to work simultaneously on different foils and superimpose their Polars
    Added Type 2 & Type 3 analysis
    Added Cl Specification capability
    Added "Cdp" storage in Polars - no compatibility with former format (author apologizes)
    Modified "Export Polars" to use same format as XFoil
    Added "Import Polar" feature to read XFoil-generated polars
    Added dialog box for free/forced Transition parameters
    Added equivalents of XFoil's WDEF and RDEF
    Added flap control
    Added Graph background color control
    Changed iteration track variables to "rms" and "max" instead of "rms", "cdf" and cdp"
    Increased space for foil animation drawing
    Solved "Cancel analysis" bug in Viscous Iterations which caused Xflr5 to run in a loop
    Solved various bugs

v0.21    November 16, 2003
    Solved crash problem in Polar Graph Options/ colors

v0.20    November 15, 2003
    Fixed some bugs
    Improved Graph Display
    Introduced OpPoint archiving

v0.1    November 4th 2003
    First release

                       **************************
