Added --subload command line option and test subload callback for testing purposes
Added --subload command line option and test subload callback for testing purposes


git-svn-id: aa838dfc23441284dd616281de4245daec5d2135@14812 16af8721-9629-0410-8352-f15c8da7e697

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