started implementing pressure handling.
committed mostly to create a new branch because stuff is getting hairy here
better pressure handling
implemented lifting gas venting
added actions to alter resource dumping rate for ballast tanks
altered ballast water resource definition to liters per unit
added a progress bar that shows pressure deviation from ideal Pressure
deleted some stuff that I did "comment out" in the last commit
BuoyancyStats now ignores parts with physicalSignificance == NONE
added bool extension function "Toggle"
implemented heat damage. Combustrogen, is finally combustible
envelopes will destroy if relative pressure is too high or too low (issue #4)
bugfix: wrong mass values in editor and flight
fixed Tech Tree.issue #3
changed version and README.md
removed some debug tweakables
Merge branch 'develop'