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.
Eliminated some warnings of type C4267 (conversion from Type1 to Type2: possible loss of data); size_t to int explicit casts added.
Fixed warning C4267 and 4244 in OSD* files
Change in OSD_FileNode and OSD_File reverted since different handle types are needed on Unix and Windows
