Improve visual appearance for depth surface

- disable intersection geometry with cell property colors
- allow opacity
- set default color to blue, as most user use this plane for oil-water contact

ApplicationLibCode/ProjectDataModel/WellPath/RimWellPathTarget.h

@@ -26,7 +26,6 @@
 #include "cafPdmField.h"
 #include "cafPdmProxyValueField.h"
 #include "cafPdmPtrField.h"
-#include "cvfVector3.h"
 
 class RimWellPathGeometryDef;