Signal prim count taint if the AbsolutePosition of a scene object changes.

This updates prim counts correctly if an object is moved by something other than an avatar (e.g. scripts, region modules)
Create TestMoveOwnerObject() regression test for this case.

OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs

@@ -325,6 +325,8 @@ namespace OpenSim.Region.Framework.Scenes
                 //m_rootPart.GroupPosition.Z);
                 //m_scene.PhysicsScene.AddPhysicsActorTaint(m_rootPart.PhysActor);
                 //}
+                
+                m_scene.EventManager.TriggerParcelPrimCountTainted();
             }
         }