fix bug in ProxyNode with DEFER_LOADING_TO_DATABASE_PAGER causing crash when children reorder during load.
fix bug in ProxyNode with DEFER_LOADING_TO_DATABASE_PAGER causing crash when children reorder during load.

scrawl/osg,openscenegraph/osg,scrawl/osg,openscenegraph/osg,openscenegraph/osg,openscenegraph/osg,scrawl/osg,scrawl/osg