From Alberto Farre, added support for caching of ProxyNode children.
From Alberto Farre, added support for caching of ProxyNode children.


XiaoCC/osg,koshman86/osg,XiaoCC/osg,ghub/osg,ghub/osg,stmh/osg,stmh/osg,ntoand/osg,stmh/osg,XiaoCC/osg,artoolkit/osg,omega-hub/osg,XiaoCC/osg,omega-hub/osg,koshman86/osg,omega-hub/osg,ntoand/osg,ghub/osg,koshman86/osg,ghub/osg,koshman86/osg,artoolkit/osg,artoolkit/osg,ntoand/osg,ntoand/osg,stmh/osg,stmh/osg,XiaoCC/osg,artoolkit/osg,omega-hub/osg