BUG: 3133.  invoke TransformModifiedEvent when new TransformNode is set

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22088 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: 3148. Fixed crash on transform node reparenting

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22089 3bd1e089-480b-0410-8dfb-8563597acbee