Applied patch from Matze Braun that was sent to the mailing list.

Applied patch from Matze Braun that was sent to the mailing list.
According to Matzes, changes are:
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-fixes fast music being replayed again and again
-fixes time being displayed negatively when tux dies because of timeout
-fixes exploding bombs that hit mrbomb, so that the hit mrbomb now really
 transform into a bomb
-updates the TODO file
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I've also fixed two more bugs listed in the TODO:
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- enemies start running backwards, when they collide with a flame
- egg gets removed when leaving the screen, while badguys don't or at
  least much later, thus its not possible to wait for an egg that
  would bounce back
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SVN-Revision: 774