Add telescience blocks on the mining Z-level

[Roomba]

I think a significant chunk of the debris field is already telesci-blocked. Also I don't really think this would increase exploring that much. Most of the people telesciencing the fancy stuff back already know where everything interesting is, so removing their ability to telesci it would just result in them beelining for them if they really want it, without very much exploration. I think the decrease in exploring the debris field is mostly because there hasn't been very much in the way of new stuff in it for a while, so everyone more or less knows what's out there. I don't think there's as big an overlap between the 'telesci stuff back' crowd and the exploration crowd as you imagine, really. You'd get decreased interest in the debris field all round - the same nerds interested in telesci can also generally brave the debris field with little difficulty, and casual explorers/budding telescientists get annoyed at all the secrecy and nerfing and leave to do something else.