Build 080721 - Revision 3

Did some more lighting (and not only) fixes, featuring two problems that were like years old already yet didn't really show up too badly, so noone noticed :)

• Fixed a bug when a projectile could hit you under some certain conditions (probably happened very rarely before, when on max slo-mo and very high framerates - and now happened on interactive pause from time to time).
• Added a missing Pause key assignment in the in-game control list ("?" in the console that is).
• Area lighting no longer shows the random cut-offs.
• Improved the raytracing algorythm for the tube lights (was somewhat inaccurate before, especially visible on the lower settings, when the refractions are disabled).