Rework address roles, making Address::role optional, rework determining uplink/downlinks/parent/children

app/Jobs/MailSend.php

@@ -69,7 +69,7 @@ class MailSend #implements ShouldQueue
 
 		// Return the system we poll
 		$u = $u->transform(function($item) {
-			if ($x=$item->parent()) {
+			if ($x=$item->uplink()) {
 				$x->uncollected_echomail = $item->uncollected_echomail;
 				$x->uncollected_netmail = $item->uncollected_netmail;
 				$x->uncollected_files = $item->uncollected_files;