* test more than 1 paragraph, by calling SplitNode()
* enable Undo, because that's the more usual situation
* remove one mode that is identical to the previous one
* use SwUnoCursor because plain SwCursor isn't corrected when nodes
  are deleted
* create a selection before calling Delete functions

Change-Id: If406bd8c37b005e431fbaebe82f297b051da1ed3