This is the new progs.dat for airquake test 20. It hopefully fixes following
problems:

- The hover was bobbing up and down ridiculously.. No more. Now you can get
  under a bridge in aircity if you use 25% throttle.
- It was leaving empty tanks and targeting boxes in the level if a player
  disconnected from a dedicated server. (??)  Now it _should_ check every
  second if there's an ownerless entity that should have an owner. I have
  not had a chance to try it out over net yet.

Also included is a wav file. Place it into airquake/progs/ directory. It
adds engine sound for the helicopter.

Iikka
