new public functions (_set_name): set full_path.

new public functions (_set_name): set full_path.

	* camel/camel-folder.c (camel_folder_set_name):
	(camel_folder_get_name):
	new public functions
	(_set_name): set full_path.

	(_set_full_name):
	(camel_folder_set_full_name):
	commented out this functions def.
	It would make things very difficult to handle, and would not
	be very useful.

	* camel/providers/MH/camel-mh-store.h:
	* camel/providers/MH/camel-mh-store.c (camel_mh_store_set_toplevel_dir):
	(camel_mh_store_get_toplevel_dir):
	* camel/providers/MH/camel-mh-folder.c (_set_name):
	* camel/providers/MH/camel-mh-folder.h:
	use (gchar *) instead of (GString *) everywhere.
	use const when necessary.

	* camel/camel-folder.h (struct _CamelFolder):
	removed unused message_list field.