Item12865: improved display of revision info

also:
- added back Clear button to category editor
- made list of buttons on category editor configurable



git-svn-id: http://svn.foswiki.org/trunk@17550 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item12865: depend on latest WikiWorkbench



git-svn-id: http://svn.foswiki.org/trunk@17551 0b4bb1d4-4e5a-0410-9cc4-b2b747904278