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.

plugins/TwitterBridge/lib/tweetinqueuehandler.php

@@ -55,9 +55,8 @@ class TweetInQueueHandler extends QueueHandler
             if ($flink instanceof Foreign_link) {
                 common_log(LOG_DEBUG, "TweetInQueueHandler - Got flink so add notice ".
                            $notice->id." to inbox ".$flink->user_id);
-                // @fixme this should go through more regular channels?
-                Inbox::insertNotice($notice, $flink->user_id);
-            }else {
+                // FIXME: How should a Twitter user get their Inbox filled with foreign tweets?
+            } else {
                common_log(LOG_DEBUG, "TweetInQueueHandler - No flink found for foreign user ".$receiver);
             }
         }