2008-06-06  Vincent Untz  <vuntz@gnome.org>

	Use the gnome-session DBus API to log out/shut down. The dialog is also
	displayed by gnome-session.
	Fix bug #507391

	* Makefile.am: remove files
	* panel-gdm.[ch]: killed, not used anymore
	* panel-logout.[ch]: killed, not used anymore
	* panel-session.[ch]: remove panel_session_request_logout()
	* libpanel-util/Makefile.am: add new files
	* libpanel-util/panel-session-manager.[ch]: new, object to interact
	with the session manager
	* panel-action-button.c: (panel_action_logout): use PanelSessionManager
	API
	(panel_action_shutdown): ditto
	(panel_action_shutdown_reboot_is_disabled): updated, with a comment
	about a regression
	* libpanel-util/panel-power-manager.c: remove useless includes
	(panel_power_manager_can_suspend): add g_return_val_if_fail
	(panel_power_manager_can_hibernate): add g_return_val_if_fail
	(panel_power_manager_attempt_suspend): add g_return_if_fail
	(panel_power_manager_attempt_hibernate): add g_return_if_fail

svn path=/trunk/; revision=11134