OpenVSP 2.9.6 fourth Beta for version 3

This version includes more small fixes and feature refinements as we inch
closer to version 3.0.

Improvements include:
 - Symmetry about ancestor's coordinate system
 - Default Source support for CFDMesh
 - Rearrange Geom Browser tab to show larger geom trees
 - Added Delete, Set Show/NoShow/ShowOnly, and surface None buttons
 - Expand custom geom #include statements and save with geom
 - Added GetCustomXSecLoc/Rot and GDEV_SCROLL_TAB

Bug fixes include:
 - Numerous surface parameter [0,1] bugs that could cause crashes.
 - Consistent triangle orientation for NASCART import/export
 - Fix skinning bugs & tweak GUI
 - Fix wing scaling