Pipes, vents, and scrubbers changes.

Third time's the charm

Atmos distribution pipe was cut off from the station, now re-connected.
Paired a vent with a scrubber in the engineering lobby.
Moved a scrubber in central hallway. Restored missing power cable and fire shutter in the previous turf.
Re-organizes engineering EVA a bit, so that a scrubber isn't lying across a scrubber pipe.
Re-colours some pipes in the engine.