trying to make AI aware of mine/explosive break point. also remove redundant test.
only rate subs if significant. still very much need correct fall+damage esp given different knocks.
Make hogs aware of dud mines and explosives. Still a bit more needed.
Apparently resetPosition is not needed at all (/pause doesn't call it and works the same)
CheckGearDrowning could delete hedgehogs gear! (CheckGearDrowning -> ResurrectHedgehog -> FindPlace). Fixes
bug #620.