Renamed uiPdmModel() to uiPdmModel_OBSOLETE()

To make it easier to see what code is using the obsolete stuff.

ApplicationCode/UserInterface/RiuMainWindow.h

@@ -88,7 +88,7 @@ public:
     void            updateScaleValue();
     void            forceProjectTreeRepaint();
 
-    RimUiTreeModelPdm* uiPdmModel() { return m_OBSOLETE_treeModelPdm;}
+    RimUiTreeModelPdm* uiPdmModel_OBSOLETE() { return m_OBSOLETE_treeModelPdm;}
 
     RiuProcessMonitor* processMonitor();