Removed used of ref_ptr<>'s internally to avoid ciricular calls on destruction.
Removed used of ref_ptr<>'s internally to avoid ciricular calls on destruction.


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