Ideas and comments for future versions (please send comments to
1dabrunz@informatik.uni-hamburg.de):

short-term:
- implement script-generation for ipfwchains

mid-term:
- show the number (and position?) of deny rules on closed categories 

long-term:
- make categories of categories possible
- visualize filters graphically (with coloured lines/arrows, computer symbols
  etc.)
- make filters graphically selectable and editable
