BETA: Second part of improvements for instance managers.
	* Small update for GlobalVariablesManager.
		* Patch by: jurchiks
	* Reviewed by: Zoey76, UnAfraid, jurchiks

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6119 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad