Updated to Alpha 3 (a)
The main goal of this update is to test a variety of solutions to give the central area a bigger role.
* expanded the area behind the point, removed all nearby healthpacks
* flipped the two stairs to make their access be from the front.
* added some cover on the sides (complete with some little ammo/health packs)
* added a yummy yet so exposed full_health pack in the central zone
