rnd-20040401-1-src

rnd-20040401-1-src
* fixed bug with destroyed robot wheel still attracting robots forever
* fixed bug with time gate switch deactivating after robot wheel time
  (while the time gate itself is not affected by this misbehaviour)
* changed behaviour of BD style amoeba to always get blocked by player
  (before it was different when there were non-BD elements in level)
* fixed bug with player destroying indestructable elements with shield