implement adding actions
(_action_signal_handler): handle actions coming from the server
(notify_notifcation_clear_actions): new method for clearning out
the actions list and hash
new method that shows and then unrefs the NotifyNotification object.
use this if you just want to fire off a quick notification.
* various compiler warning cleanups
signal added
(notify_notification_clear_hints): New API for clearing out the
hints hash
(notify_notification_ref, notify_notification_unref): removed - use
g_object_ref/unref
* tests/*: Various changes to the test binaries