Change some Salmon events and similar

Use Profile instead of User and (if we know it) send along the target
profile, so a Diaspora plugin can encrypt to the receiver.

plugins/OStatus/lib/salmonqueuehandler.php

@@ -40,8 +40,9 @@ class SalmonQueueHandler extends QueueHandler
         assert(is_string($data['entry']));
 
         $actor = Profile::getKV($data['actor']);
+        $target = array_key_exists('target', $data) ? Profile::getKV($data['target']) : null;
 
-        Salmon::post($data['salmonuri'], $data['entry'], $actor->getUser());
+        Salmon::post($data['salmonuri'], $data['entry'], $actor, $target);
 
         // @fixme detect failure and attempt to resend
         return true;