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.
Examining index sign before casting to Standard_Size.
Argument of method VrmlData_ArrayVec3d::Value() changed from Standard_Integer to Standard_Size to be consistent with its use (avoid compiler warnings)
