Xenoflora + misc changes

See the commit for details.

https://dl.dropbox.com/s/8u3n2zvh5wjjjwm/florax.png

Tl;dr - Moved Xenobotany to Xenoflora on Research outpost, and moved things around a little in the process. Now its part of sample preparation.

Fixed piping in isolation rooms so you can actually remove gas once you put it in.

Fixed harvesting room so the south pad isn't blocked.


Unrelatedly also, but I can remove this if you want:

Added cautery + fix-o-vein to robotics because literally the only thing they couldn't already do with a lit cigarette + cable coil was put IPC heads back on, and finding a fix-o-vein either involves convincing a cyborg to steal it from surgery or running the paper trail between medical and cargo for a surgery crate (because fix-o-veins aren't printable in autolathes).