possible name for "subtype": category
added netgen OpenCascade mesher, added preprocessor guards
added netgen OpenCascade mesher
moved implementation to cpp
changed to OpenCascade Community Edition CAE (OpenCascade 6.5)
added OpenCascade netgen mesher
added OpenCascade support for netgen, added defines for external projects (e.g. "-DWITH_TETGEN")