* limit atmos/fire alerts to the current z_level

* atmos/fire alerts are now linked to an object and not its area, as intended
* simplified and full pathed the radio frequency datum
* made radio objects properly clean on del/qdel, instead of letting the radio controller remove nulls at each post_signal()

code/ATMOSPHERICS/components/binary_devices/pump.dm

@@ -26,6 +26,11 @@ Thus, the two variables affect pump operation are set in New():
 	var/id = null
 	var/datum/radio_frequency/radio_connection
 
+/obj/machinery/atmospherics/binary/pump/Destroy()
+	if(radio_controller)
+		radio_controller.remove_object(src,frequency)
+	..()
+
 /obj/machinery/atmospherics/binary/pump/on
 	on = 1