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.


marchelbling/osg,marchelbling/osg,scrawl/osg,scrawl/osg,tomasthoresen/osg,scrawl/osg,openscenegraph/osg,openscenegraph/osg,marchelbling/osg,artoolkit/osg,openscenegraph/osg,tomasthoresen/osg,jtorresfabra/osg,jtorresfabra/osg,artoolkit/osg,openscenegraph/osg,tomasthoresen/osg,artoolkit/osg,jtorresfabra/osg,marchelbling/osg,tomasthoresen/osg,scrawl/osg,jtorresfabra/osg,artoolkit/osg