Removed Inbox from core (unused since 4b2a66ed29)

Added the following FIXME:
How should a Twitter user get their Inbox filled with foreign tweets?

Every imported Twitter user has a profile in the Profile table, so we
could setup a Subscription entry for each of those, meaning they get
collected in the InboxNoticeStream... But this would mean a lot of
unnecessary entries and listings that generally just point to the
locked down Twitter service.

Let's figure out a good relation so we can connect any profile to any
imported foreign notice, so it shows up in the "all" feed.

lib/distribqueuehandler.php

@@ -58,19 +58,11 @@ class DistribQueueHandler
      * If this function indicates failure, a warning will be logged
      * and the item is placed back in the queue to be re-run.
      *
-     * @fixme addToInboxes is known to fail sometimes with large recipient sets
-     *
      * @param Notice $notice
      * @return boolean true on success, false on failure
      */
     function handle($notice)
     {
-        try {
-            $notice->addToInboxes();
-        } catch (Exception $e) {
-            $this->logit($notice, $e);
-        }
-
         try {
             $notice->sendReplyNotifications();
         } catch (Exception $e) {