Fixed copy constructor so that the _stage member variable was set to this correctly.
Fixed copy constructor so that the _stage member variable was set to this
correctly.


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