Update loadfriends.php

Corrected query and extended amount of informtion shown about your
friends.
Update loadgrouplist.php

Made query only return distinct results.  Also fixed possible issue with
returned data.
Update outbox.php

If the expiration time is NULL say "No expiration" instead of 0.
Update sendmessage.php

Updated code to allow to send to groups, a feature previously added
without functionality.