Removes most hard-coded z level checks

code/modules/pda/cart_apps.dm

@@ -316,8 +316,7 @@
 	if(shuttle_master.supply.mode == SHUTTLE_CALL)
 		supplyData["shuttle_moving"] = 1
 
-	// TODO: Tie into space manager
-	if(shuttle_master.supply.z != ZLEVEL_STATION)
+	if(!is_station_level(shuttle_master.supply.z))
 		supplyData["shuttle_loc"] = "station"
 	else
 		supplyData["shuttle_loc"] = "centcom"

code/modules/pda/messenger.dm

@@ -158,7 +158,7 @@
 		if(signal.data["done"])
 			useTC = 1
 			var/turf/pos = get_turf(P)
-			// TODO: Tie into space manager
+			// TODO: Make the radio system cooperate with the space manager
 			if(pos.z in signal.data["level"])
 				useTC = 2
 				//Let's make this barely readable