refix explosions
BattlescapeGenerator: tweak tank positioning

BattlescapeState: tweak btnUnitUpClick() when kneeled
Pathfinding: tweak kneeling, ie. Take It Out
	- done so much elsewhere, looks like I don't need it anymore.
DogfightState: tweak that rediculous formula for hitchance
basically ...

ignore ( horizontal & vertical blockage rewrites )
Merge branch 'master' of https://github.com/SupSuper/OpenXcom into oXc_kL
Conflicts:
	src/Battlescape/TileEngine.cpp
	src/Battlescape/TileEngine.h