BUGS
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- dmalloc shows duplicate deletion after merging two lines and
  deleting the second half

- word wrap for objects with lots of non-space needs to search in positive
  direction if begin of first object is reached

TODO
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- merge RecalulateXXX and Layout() into one

  - UNDO!!
  - replacement of llist in window

Improve speed! (See layout problem below!)

  - wxlwindow needs to shrink scrollbar range when window contents get removed
  - When selecting with the mouse, scroll window if pointer is outside.



- The import of a private data object does not work yet, we need to get
  the objects back from the string.
  
- update rectangle (needs support in wxllist and wxWindows)
  --> needs a bit of fixing still
      some code bits are commented out in wxlwindow.cpp
      offset handling seems a bit dodgy, white shadow to top/left of cursor

  - DragNDrop
  - Update docs, do full rtf/html editing. 
  - Verify/fix html export.