(start_loading_current_folder): Check if the folder to be loaded
	is non-native for the local_only=TRUE case; if so, return an error
	as we are configured to load only local folders.
	(reload_current_folder): Pass on errors from
	start_loading_current_folder().  Tighten the preconditions, as we
	are sure that we can only receive non-NULL folder-files to load.
	(refresh_current_folder_and_file_part): Pass on errors from
	reload_current_folder().  At the very end, assert the invariant
	described above.

Signed-off-by: Federico Mena Quintero <federico@novell.com>

svn path=/trunk/; revision=22182