Some minor fixes and new options for the .showarea and .hidearea commands:

 - Fixed Trinity::XP::GetGrayLevel function for level between 40 and 59.
 - Fixed Player::GetQuestDialogStatus so it no longer consider green quests as lowlevel ones.
 - The showarea/hidearea commands set entire zone as explored/unexplored (+ achievement) when no argument given.
TDB 335.57 - 2014/10/20
Merge remote-tracking branch 'origin/TDB'

Conflicts:
	src/server/game/World/World.h
feat (Loot) : only interesting loot

 - Loot only equipments the player can equip.
 - Loot only recipes the player has the profession for or didn't already learn.
feat (Loot) : custom rates for loot by quality

Can set the minimum drop rate for quality uncommon+ loot.
fix (Loot) : remove filtered loot from containers

Fix the bug when a container contains only filtered loot and doesn't disappear.
feat (Loot) : add option to limit number of same items looted