reinvigorate mining

[Noah Buttes]

Re-opening the mining z-level really doesn't solve the inherent problems with mining, but it's a step in the right direction.

P.S. can mining mesons please not have that godawful eye-sore of an overlay? Miners need to wear those things in order to do their job properly.

Edit: I agree that a lavaland style thing would be the ideal solution, but that sounds like a hell of a lot of hard work for the Coders.