Scorched Husks

I experimented to give husks a more wrecked look #4631 as this gives an otherwise false impression to the players http://forum.dune2k.com/topic/24184-opend2k-cross-platform-reimplementation-of-dune-2000/?p=385478

![husks](https://f.cloud.github.com/assets/756669/2181395/b8f1ab66-974e-11e3-8110-a5b8fbc6dc9d.png)