Core/Scripting: Add Wrathbone Flayer script to show channelling visual and correct combat AI.
Core/Movement: Do not remove movement flags that have special opcodes associated with them on teleport

Closes #10162
Script/Commands: Fix a crash in .arena captain command
DB/Errors: Fix a db startup error
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.
Merge pull request #7 from TrinityCore/master

TC Update 13/7/2013