- Made MUIA_List_Title settable.
 - A valid column was reported by the TestPos method even if the mouse 
   position was to the left of the list. Fixed.
 - Some tidying/optimisation.


git-svn-id: https://svn.aros.org/svn/aros/trunk/AROS@48830 fb15a70f-31f2-0310-bbcc-cdcc74a49acc