Fix previousOwner bug

Game did lose data of prev owner.
Merge pull request #958 from Yankes/PreviousOwnerBug

Fix previousOwner bug
fix some warnings
fix firestorm deployment
fix typo
Merge branch 'master' of https://github.com/SupSuper/OpenXcom into oXc_kL

Conflicts:
	bin/data/Ruleset/XcomUtil_Fighter_Transports.rul
	src/Battlescape/BattlescapeGenerator.cpp
	src/Battlescape/Map.cpp
	src/Engine/Surface.cpp
	src/Ruleset/MapScript.h
	src/Savegame/BattleItem.cpp
	src/Savegame/BattleItem.h
	src/Savegame/SavedBattleGame.cpp
	src/Savegame/Tile.cpp