Attributes to <group/>

While implementing ACTION 2338, I discovered an error with the declared 
attributes of <group/>:


 Common Attributes: Common, Appearance, Single Item Binding (optional)


which was however declared differently in the overview table. So I made 
them consistent:


 Common Attributes: Control Common


Control Common is: Common, Evaluation, Appearance, Navigation, UI Common, 
Single Item Binding


This is just to report the change.


Steven