Resolves issue 594 - You can no longer use Mech-drills/clamps/etc to interact with your hud items.

Fixed an old feature that diverted clicks on a hud inventory-slot (say, the place you put your bag) to the object in that slot (i.e. making it easier to click small items and also making it possible to remove things that have borked and turned invisible

Fixed admins being able to change their own rank via chgadlvl.

Insignificant tweaks to DblClick() just removed some useless bits near the top.

Known issues:
Can't put straight jackets on aliums anymore for some reason
Aliums can remove straight jackets from themselves.
Can still mecha-drill a few things you shouldn't be able to >_>

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4032 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/admin/admin.dm

@@ -1417,6 +1417,7 @@ var/global/BSACooldown = 0
 	//change admin level
 		var/rank = href_list["chgadlvl"]
 		var/client/C = locate(href_list["client4ad"])
+		if(!istype(C))	return
 		if(rank == "Remove")
 			C.clear_admin_verbs()
 			C.update_admins(null)
@@ -1424,6 +1425,9 @@ var/global/BSACooldown = 0
 			message_admins("[key_name_admin(usr)] has removed [C]'s adminship", 1)
 			admins.Remove(C.ckey)
 		else
+			if(C == owner)	//no promoting/demoting yourself
+				message_admins("[C] tried to change their own admin-rank >:(")
+				return
 			C.clear_admin_verbs()
 			C.update_admins(rank)
 			log_admin("[key_name(usr)] has made [C] a [rank]")