This bug fix release takes care of handful of problems that some users have hit. One recent bug, the others have been around a while.

Thanks to Jason Welstead for characterizing one bug and to Alex Gary for fixing it.

Bug fixes:

• Negative volume flag not working for Custom Geoms.
• Crash on minimize/restore of main window on MacOS.
• Mixed tolerances in CompGeom causing removal of watertight shapes.
• Force true closure of six-series airfoils.