Add sub-surface ice on Mars.
Update zh_CN.lang
Add atmospheric composition.
Oxygen collector, torches, flint&steel check atmospheric composition.
Support 2 tiers of Galacticraft power.
Minor fix to some missing language text in GUIs.
Merge pull request #537 from sb023612/master

Update zh_CN.lang
Tier 2 power makes Electric Ingot Compressor faster.