spelling fix
vertical movement fix
melee fix pt1
i should up-to-date meleeWeapon vs mainHand for melee determinations:

but it depends on how people prefer to ruleset their monsters.

Merge branch 'master' of https://github.com/SupSuper/OpenXcom into oXc_kL
Conflicts:
	src/Battlescape/AlienBAIState.cpp
	src/Battlescape/Pathfinding.cpp
	src/Battlescape/UnitWalkBState.cpp
	src/Savegame/BattleUnit.cpp