Too many changes to list.
Players are no longer implicitly zombies if they're not humans. Players are no longer implicitly humans if they're not zombies. This is preparation for a third, optional spectator team. A few small optimizations and fixes.
Some maps move the spawns for each level.
Consider possibility of nil or NULL being a value in the tables returned from util.FindInSphere, util.FindInBox, and ents.GetAll.
