License statement text corrected; compiler warnings caused by Bison 2.41 disabled for MSVC; a few other compiler warnings on 54-bit Windows eliminated by appropriate type cast
Wrong license statements corrected in several files.
Copyright and license statements added in XSD and GLSL files.
Copyright year updated in some files.
Obsolete documentation files removed from DrawResources.
Is2DClosed() added to reject an improper existing surface
Add OnlyClosed=Standard_False argument
Call BRepLib_FindSurface with OnlyClosed=Standard_True
fix Is2DClosed() to check intermediate points of wire in 2D
fix Is2DClosed() - correct tolerance used for the last point
fix Is2DClosed() - correct getting 2d points to compare