Grilles and rods.

Grilles no longer return more rods than they were created from when destroyed (by method other than wirecutters).
Rods are now acquired from and returned to a pool.
Also adds a pre-broken grille for mapping, avoids the case where one might be able to destroy the same grille twice.

code/game/objects/items/weapons/flamethrower.dm

@@ -82,7 +82,7 @@
 		if(ptank)
 			ptank.loc = T
 			ptank = null
-		new /obj/item/stack/rods(T)
+		PoolOrNew(/obj/item/stack/rods, T)
 		qdel(src)
 		return
 

code/game/objects/items/weapons/twohanded.dm

@@ -144,11 +144,11 @@
 			var/obj/structure/window/W = A
 
 			new /obj/item/weapon/shard( W.loc )
-			if(W.reinf) new /obj/item/stack/rods( W.loc)
+			if(W.reinf) PoolOrNew(/obj/item/stack/rods, W.loc)
 
 			if (W.dir == SOUTHWEST)
 				new /obj/item/weapon/shard( W.loc )
-				if(W.reinf) new /obj/item/stack/rods( W.loc)
+				if(W.reinf) PoolOrNew(/obj/item/stack/rods, W.loc)
 		qdel(A)