Make Vec3d reflect methods const.
Remove unused float 4x4 Matrix
Make Matrix4d const correct
Make Quat more consty
Make set browser in Geom window work properly.
Add STEPCode library.  Master as of 3/29/14
Add STEP export to GUI
Add STEPutil boiler plate for working with STEP file
Implement writing surfaces to STEP files
Attempt to force dependency of util on STEPCODE.

Some of the headers aren't generated until STEPCODE completes.  Anything
that depends on those should wait.