Add a way to undo polymorph

[69andahalf]

At this point Polymorph is basically pre-nerf Shocking Touch, where you can just teleport to someone, magic missile them, and remove them from the game instantly. Sure you can technically run around the station as a critter, but you're going to end up dead sooner or later as they're so weak. IMO it should be a temporary transformation, but I doubt that'll slide with most people.