Refactor delete operations for pdm objects.

ApplicationCode/ProjectDataModel/RimWellLogPlot.cpp

@@ -60,6 +60,8 @@ RimWellLogPlot::RimWellLogPlot()
                                   ":/WellLogPlot16x16.png",
                                   "",
                                   "A Well Log Plot With a shared Depth Axis and Multiple Tracks" );
+
+    setDeletable( true );
 }
 
 //--------------------------------------------------------------------------------------------------