1. Added pressure check in Manual Mode depressurize routine
2. More message text cleanup
1. Added platform lock on bootup to account for stuck pressurized bottle with P2 pressure low. Closes Relay4 to conserve gas to keep cylinder up.
1. Increased pressure drop required to signal pressure sag (50 --> 75)
2. Added platform lock on bootup for stuck pressurized bottle with low P2 pressure
1. Minor changes to Pressure drop loop and Null pressure start up loop to better lock platform when gas is low and bottle pressure is high.
2. Minor cleanup of code.