First changes to speedup OxygenPressureProtocol
Further changes to speed up existing algorithm
More speedup of sealer and a bugfix: now wont be sealed if a permeable non-air block is on the edge of the sealable area
Small change to dungeon generation to prevent any tile entity overlap - see my recent comments in issue #295
Sealer and BreathableAir blocks updated to match ThreadFindSeal
Merged commit 1ace950 from upstream repo (Attempt to fix concurrent problem causing NPE)
Completed merger with upstream, now fully up to date
More speedup for Sealer; and forgot to initialise breatheableAirID (oops)
Changed algorithm so it now works outwards in layers; much smaller call stack.  Fixes issue #326
Added the sealers own position to the checked list - this saves a small amount of time.
Merge pull request #325 from radfast/master

Oxygen Sealer Algorithm speedup (see issue #286)