[b41] Double hitting projectiles

[Dervic]

Projectiles are double hitting if a target moves to the square where the projectile is.
This is very easy to reproduce with a void wand (Void Blast): Cast Void Blast on any direction and move to the projectile, there will be 2 hits, works if you get a monster to move there too ofc.

[tiger_eye]

*bump* still in b42. Observed with projectiles I'm firing as a corruptor.

This was also reported here:

http://forums.te4.org/viewtopic.php?f=42&t=33743