Qvitter API changes (thanks hannes2peer)

I implemented changes from quitter.se's new API that their front-end qvitter
uses, https://github.com/hannesmannerheim/qvitter/blob/master/api-changes-1.1.1/CHANGES

However I left out the URL shortening commens, since I believe whatever behaviour
they experienced that caused them to implement this was a bug (or many) and should
be fixed in their proper areas and that shortening should not be entirely left
out in API calls.

actions/apisearchatom.php

@@ -31,8 +31,6 @@ if (!defined('STATUSNET') && !defined('LACONICA')) {
     exit(1);
 }
 
-require_once INSTALLDIR.'/lib/apiprivateauth.php';
-
 /**
  * Action for outputting search results in Twitter compatible Atom
  * format.