Adds #455

Suit cooling units will now work while on back as well, much like an
oxygen tank. They also come with an invisible sprite for now, will
figure something out for that at a later date.

code/game/objects/items/devices/suit_cooling.dm

@@ -4,7 +4,8 @@
 	w_class = 4
 	icon = 'icons/obj/device.dmi'
 	icon_state = "suitcooler0"
-	slot_flags = SLOT_BACK	//you can carry it on your back if you want, but it won't do anything unless attached to suit storage
+	item_state = "suitcooler0"	//hacky, but yeah, works for now.
+	slot_flags = SLOT_BACK	//will now work while on back - Skull132
 
 	//copied from tank.dm
 	flags = FPRINT | TABLEPASS | CONDUCT
@@ -83,10 +84,10 @@
 
 	var/mob/living/carbon/human/H = M
 
-	if (!H.wear_suit || H.s_store != src)
-		return 0
+	if (H.wear_suit && (H.back == src || H.s_store == src))
+		return 1
 
-	return 1
+	return 0
 
 /obj/item/device/suit_cooling_unit/proc/turn_on()
 	if(!cell)