Replace the Nuke Ops Medic poison bottle with something less random

[Studenterhue]

I've entertained the thought of separating the poison bottle into a "disease bottle" with all the deadly disease reagents and a "poison bottle" with the regular poisons, because both are used differently as Mouse described. All the jobs that can buy poison bottles can then have a bit more leeway in getting the kind of poison they want, but that if it seems a little too powerful or whatever, perhaps we can just give Medic a special poison bottle with only regular poisons, similar to how the Infiltrator gets a limited-use cloaker.