Added an OSG_INIT_SINGLETON_PROXY to make sure that the ApplicationUsage singleton gets intialized before usage.
Added an OSG_INIT_SINGLETON_PROXY to make sure that the ApplicationUsage singleton gets intialized before usage.


git-svn-id: aa838dfc23441284dd616281de4245daec5d2135@14312 16af8721-9629-0410-8352-f15c8da7e697

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