fs34b: #i117039# restore old behavior of SfxUndoManager::EnableUndo
fs34b: #i117039# restore old behavior of SfxUndoManager::EnableUndo

don't count the calls, but maintain a simple flag.
Consequently, let sw's UndoManager simply delegate now, and
change the UndoManagerHelper to maintain a lock counter itself.
Conflicts:

	framework/source/fwe/helper/undomanagerhelper.cxx

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core