Changed the zombie interaction a bit. Now they should only rot/swell/blister on the skin, so they don't suffocate, they also should also start coughing blood about 100 steps before they finally turn. Giving you some warning system.

I'm fine with zombies migrating in, but the problem is they come as full zombies, the entire wounds screen filled with yellow text is a bit of a tip off. Furthermore, all they do is kill the migrants and their animals. Only the berzerkers are the problem though, I met a rather benign one that was content with running away.