Fixes to atmosia computers and gas sensors

__Atmospherics fixes :__

Fixed a leftover that was preventing atmospherics computers to actually recieve input from the various sensors in the room.

Also changed the "output" variable of the gas tanks' sensors, so they actually send data about the gas mixture in each of them.

_Before_ : 
![before](https://cloud.githubusercontent.com/assets/7117411/2685718/7162d7c0-c1d3-11e3-8540-a5e156a6f17c.png)

_After_ : 
![after](https://cloud.githubusercontent.com/assets/7117411/2685722/8044582c-c1d3-11e3-8896-01bdc047e3c1.png)