Instates the homegun-basements and PD armory

This tightens and implements the new spawngroups.  Basically, civilians
go with rifles and shotguns rather than SMGs, and the police have far
less variety in the guns left around at base.

Cops can still have tonfas, grenade launchers, etc--just on their rezzed
person.  (And yes, some departments are procuring P90s IRL.)