destroyed. Among other things, this fixes the bug where IMAP
	stores weren't disconnected at shutdown.

	* mail-threads.c (update_active_views): Update for
	folder_browser_factory_get_control_list change to EList.

	* folder-browser-factory.c: Turn control_list into an EList so
	that we can safely remove items from it while it's being iterated
	(which will happen as FolderBrowsers are destroyed at shutdown
	while the thread code is trying to update the status bars).
	(control_destroy_cb): Just destroy the folder_browser.
	(browser_destroy_cb): New callback for FolderBrowser destroy.
	Remove the control from control_list here instead of
	control_destroy_cb, because the controls don't seem to get
	destroyed reliably...

	* component-factory.c: Clean up stuff.
	(factory_destroy): Get rid of this.
	(owner_unset_cb): Schedule an idle handler to quit.
	(idle_quit): Wait for all of the FolderBrowsers to be destroyed
	and then destroy the storages and quit.

svn path=/trunk/; revision=6830