Adds "Xenobiologist" as its own separate job
Reconfigured the job prefs panel to look nicer

Thanks Deccy for pointing out a one pixel difference
Adds Xenobiologist spawnpoints

* Xenobiologist has two spawns in .. xenobiology
* Former xenobio scientist spawn moved to R&D lab
Merge remote-tracking branch 'upstream/bleeding-edge-freeze' into bleeding-edge-freeze
Fixed a small spelling error in job prefs
Merge pull request #3045 from Kilakk/bleeding-edge-freeze

Adds Xenobiologist as its own job.