With direction from Paul Melis, fixed bug in CopySharedSubgraphsVisitor which prevented it being applied.  Also fix inappropriate comment.
With direction from Paul Melis, fixed bug in CopySharedSubgraphsVisitor which prevented
it being applied.  Also fix inappropriate comment.


git-svn-id: 23b6355f2bb369032457de4eb5f713ee134f73a8@5162 16af8721-9629-0410-8352-f15c8da7e697

joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg