Updated MetaStation.v39G.dmm to MetaStation.v39H.dmm

*Added the gravity generator, just above engineering. It's more vulnerable than on Box.
*Rearranged the incinerator room so the turbine computer works, also added a camera to monitor the vent.
*Added three tear gas grenades to the armory.
*Fixed some layout issues above the mining dock.

Full image: https://dl.dropboxusercontent.com/u/858120/Static/SS13/MetaStation/14-03-22%2011-45%20MSv39H.png
Raw file: https://dl.dropboxusercontent.com/u/858120/Static/SS13/MetaStation/14-03-22%2011-51%20MetaStation.v39H.Merged.dmm.zip

Wiki update soon.