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/modules/mob/living/bot/floorbot.dm

@@ -217,7 +217,7 @@
 				if(building == 1)
 					I = new /obj/item/stack/tile/plasteel(src)
 				else
-					I = new /obj/item/stack/rods(src)
+					I = PoolOrNew(/obj/item/stack/rods, src)
 				A.attackby(I, src)
 		target = null
 		repairing = 0

code/modules/mob/living/simple_animal/hostile/retaliate/drone.dm

@@ -183,16 +183,16 @@
 			step_to(O, get_turf(pick(view(7, src))))
 
 		//rods
-		O = new /obj/item/stack/rods(src.loc)
+		O = PoolOrNew(/obj/item/stack/rods, src.loc)
 		step_to(O, get_turf(pick(view(7, src))))
 		if(prob(75))
-			O = new /obj/item/stack/rods(src.loc)
+			O = PoolOrNew(/obj/item/stack/rods, src.loc)
 			step_to(O, get_turf(pick(view(7, src))))
 		if(prob(50))
-			O = new /obj/item/stack/rods(src.loc)
+			O = PoolOrNew(/obj/item/stack/rods, src.loc)
 			step_to(O, get_turf(pick(view(7, src))))
 		if(prob(25))
-			O = new /obj/item/stack/rods(src.loc)
+			O = PoolOrNew(/obj/item/stack/rods, src.loc)
 			step_to(O, get_turf(pick(view(7, src))))
 
 		//plasteel

code/modules/vehicles/vehicle.dm

@@ -201,8 +201,8 @@
 	src.visible_message("\red <B>[src] blows apart!</B>", 1)
 	var/turf/Tsec = get_turf(src)
 
-	new /obj/item/stack/rods(Tsec)
-	new /obj/item/stack/rods(Tsec)
+	PoolOrNew(/obj/item/stack/rods, Tsec)
+	PoolOrNew(/obj/item/stack/rods, Tsec)
 	new /obj/item/stack/cable_coil/cut(Tsec)
 
 	if(cell)