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/global.dm

@@ -76,7 +76,6 @@ var/list/bombers = list(  )
 var/list/admin_log = list (  )
 var/list/lastsignalers = list(	)	//keeps last 100 signals here in format: "[src] used \ref[src] @ location [src.loc]: [freq]/[code]"
 var/list/lawchanges = list(  ) //Stores who uploaded laws to which silicon-based lifeform, and what the law was
-var/list/admins = list(  )
 var/list/shuttles = list(  )
 var/list/reg_dna = list(  )
 //	list/traitobj = list(  )