Mob size tweaks.

Merges the use of the is_small and mob_size into one.
Changes the species size handling to set the mob size instead of being yet another separate var to check.

code/game/objects/structures/crates_lockers/closets.dm

@@ -11,7 +11,7 @@
 	var/wall_mounted = 0 //never solid (You can always pass over it)
 	var/health = 100
 	var/breakout = 0 //if someone is currently breaking out. mutex
-	var/storage_capacity = 30 //This is so that someone can't pack hundreds of items in a locker/crate
+	var/storage_capacity = 2 * MOB_MEDIUM //This is so that someone can't pack hundreds of items in a locker/crate
 							  //then open it in a populated area to crash clients.
 	var/open_sound = 'sound/machines/click.ogg'
 	var/close_sound = 'sound/machines/click.ogg'
@@ -20,8 +20,6 @@
 	var/store_items = 1
 	var/store_mobs = 1
 
-	var/const/default_mob_size = 15
-
 /obj/structure/closet/initialize()
 	if(!opened)		// if closed, any item at the crate's loc is put in the contents
 		var/obj/item/I
@@ -145,14 +143,13 @@
 	for(var/mob/living/M in src.loc)
 		if(M.buckled || M.pinned.len)
 			continue
-		var/current_mob_size = (M.mob_size ? M.mob_size : default_mob_size)
-		if(stored_units + added_units + current_mob_size > storage_capacity)
+		if(stored_units + added_units + M.mob_size > storage_capacity)
 			break
 		if(M.client)
 			M.client.perspective = EYE_PERSPECTIVE
 			M.client.eye = src
 		M.forceMove(src)
-		added_units += current_mob_size
+		added_units += M.mob_size
 	return added_units
 
 /obj/structure/closet/proc/toggle(mob/user as mob)

code/game/objects/structures/kitchen_spike.dm

@@ -32,7 +32,7 @@
 
 	if(istype(victim, /mob/living/carbon/human))
 		var/mob/living/carbon/human/H = victim
-		if(!H.species.is_small)
+		if(!issmall(H))
 			return 0
 		meat_type = H.species.meat_type
 		icon_state = "spikebloody"