Core/Players: Dueling players in your party / raid should not make them always detectable.

Fixes seeing stealthed rogues & druids, as well as invisible mages in duels.
DB/Items: Change item_template.Flags to uint32 (int(10) unsigned)
SQL: Prevent a warning in 2013_07_14_01_world_item_template.sql
Merge remote-tracking branch 'origin/master' into 4.3.4

Conflicts:
	src/server/game/Globals/ObjectMgr.cpp