Removed the use of __FUNCTION__ from MemoryManager to remove problems with

VisualStudio .NET compile.

Added support for OSG_NOTIFY_LEVEL and OSG_FILE_PATH into the relevant getenv
routines.  This compliments the exisiting OSGNOTIFYLEVEL & OSGFILEPATH which
are deprecated but still supported.  The OSG_ version are more consistent
with the rest of the env variables used in the OSG.

src/osg/Notify.cpp

@@ -39,7 +39,8 @@ bool osg::initNotifyLevel()
 
     g_NotifyLevel = osg::NOTICE; // Default value
 
-    char *OSGNOTIFYLEVEL=getenv("OSGNOTIFYLEVEL");
+    char* OSGNOTIFYLEVEL=getenv("OSG_NOTIFY_LEVEL");
+    if (!OSGNOTIFYLEVEL) OSGNOTIFYLEVEL=getenv("OSGNOTIFYLEVEL");
     if(OSGNOTIFYLEVEL)
     {