Tweaked RD and Medbay

I've unfucked all newscasters and fire extinguishers, added a few more buttons, gave robotics a desk and fixed the fact that one of the external airlocks (the one near the engineering solars) would leave the corpses stuck against another part of the station if you'd throw one out there. Also, because people tought chemistry was too huge, I've put a maintenance tunnel between the morgue, chemistry, surgery and genetics. Not sure how usefull it is, since only the CMO can acces all of these (or any useful combination of them), but it's there anyway. I've also changed chemistry a bit due to said maintenance tunnel.