Changed some global_list stuff:

>tried to make the comments less confusing.
>Removed the procs for rebuilding the lists (they weren't meant to be used and half were broken anyway).
>added a directory. It maps ckey to client like so directory[ckey] = client. It could be used for PMs, banning, and various other admin tools rather than using \ref[]
>var/list/admins is now a list of clients whom are admins.
>var/list/admin_datums is what var/list/admins used to be. A map from ckey -> admin datum
Most of this is so I can add modular admin ranks in a non-horrendous way and fix some existing issues.
>var/list/client_list is now var/list/clients (laziness sorry)
>removed some needless loops and stuff.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4951 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/client/client procs.dm

@@ -95,21 +95,22 @@
 	if(byond_version < MIN_CLIENT_VERSION)		//Out of date client.
 		return null
 
-	client_list += src
-	if ( (world.address == address || !address) && !host )
-		host = key
-		world.update_status()
+	clients += src
+	directory[ckey] = src
 
 	//Admin Authorisation
-	var/datum/admins/Admin_Obj = admins[ckey]
-	if(istype(Admin_Obj))
-		admin_list += src
-		holder = Admin_Obj
+	holder = admin_datums[ckey]
+	if(holder)
+		admins += src
 		holder.owner = src
 		holder.state = null
 
 	. = ..()	//calls mob.Login()
 
+	if( (world.address == address || !address) && !host )
+		host = key
+		world.update_status()
+
 	if(holder)
 		admin_memo_show()
 
@@ -122,8 +123,10 @@
 /client/Del()
 	if(holder)
 		holder.state = null
-		admin_list -= src
-	client_list -= src
+		holder.owner = null
+		admins -= src
+	directory -= ckey
+	clients -= src
 	return ..()