- fix bb computation to avoid model jumping around when adding points in z=0 plane
- pass interpol matrices as ref

removed parFromPoint and closestPoint from GEdge; replace their use in
cgns code by appropriate reparamMeshVertex calls (not tested: I don't have
cgns)

removed now unused golden section minimizer (brent), now unused

API cleanup: removed unused functions

corrected some bugs in 2d mesher & occ interface

bidir db: phase 3 -- move all the old geo stuff into Geo/

Plane surfaces are now recognized and the
usual gmsh "cross" is drawn correctly

occ work

start opencascade integration