Renamed /datum/organ/external to /datum/limb.

Updated all files.

Removed the skeleton and skin organs.

Updated WIP surgery.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@5689 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/assembly/mousetrap.dm

@@ -40,7 +40,7 @@
 	proc/triggered(mob/target as mob, var/type = "feet")
 		if(!armed)
 			return
-		var/datum/organ/external/affecting = null
+		var/datum/limb/affecting = null
 		if(ishuman(target))
 			var/mob/living/carbon/human/H = target
 			switch(type)