Fix issues with New and Destroy in NTNet

- New() on atoms needs to call parent.
- Destroy() needs to return a qdel hint.
- Only add yourself to processing in Initialize() to make sure globals are instantiated.

code/modules/modular_computers/NTNet/NTNet_relay.dm

@@ -113,7 +113,7 @@
 	for(var/datum/computer_file/program/ntnet_dos/D in dos_sources)
 		D.target = null
 		D.error = "Connection to quantum relay severed"
-	..()
+	. = ..()
 
 /obj/machinery/ntnet_relay/attackby(var/obj/item/weapon/W as obj, var/mob/user as mob)
 	if(W.is_screwdriver())