some vehicle and turret tweaks (optimization for swingarm and harby improvements)

+ increased collision radius on lowlandsroundhouseturret

+ MD5s for german blood packages.

+ Fix for invulnerability bug.

+ When Louis fixed some DXT stuff he forgot to set LOD_Playerskin (skins were world - doh!)

+ Fix for stationary turrets failing to kill someone standing on their respawn point.

+ Fix for scoring bugs found by Tantalus:
Made it so that most kill bonuses don't apply to self-kills. The artifact carrying bonus still applies.

+ potential fix for two people trying to use the same vehicle/turret/stationary turret simultaneously

+ fix for memory leak on dedicated server (thanks Tantalus!)