Gas Mixer

A SCUBA gas mixing application. Computes required amounts of oxygen, helium, and top-up gas (air or custom) to mix nitrox and trimix. Partial pres or continuous blending, imperial or Metric. Also calculates MOD, EAD, END, and best mix. Imperial and metric units, ideal gas laws and Van der Waals.

Recent changes:
- Fixed a possible crash when trying to blend with a topup gas that has no Nitrogen component
- By user request, increased max pressures to 400 bar in metric