removed src arguments from new /obj/screen(src) as src was a datum anyway. This is to remove confusion.

When hud_used is deleted, references to those objects are removed, hence they are garbage collected.
Removed some code from metroids which could possible delete global_hud objects which would cause problems.

Added a verb to code/WorkInProgress/carn/debug_locnull.dm which prints all atoms with loc==null to world.log

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4774 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/mob/mob.dm

@@ -351,10 +351,7 @@ var/list/slot_equipment_priority = list( \
 	if(!client)
 		log_game("[usr.key] AM failed due to disconnect.")
 		return
-	for(var/obj/screen/t in usr.client.screen)
-		if (t.loc == null)
-			//t = null
-			del(t)
+	client.screen.Cut()
 	if(!client)
 		log_game("[usr.key] AM failed due to disconnect.")
 		return