Fixed bug 3811 (shallow file counts and top-left text are fetched
	even for non-displayed hidden/backup items).

	* libnautilus-extensions/nautilus-directory-private.h:
	* libnautilus-extensions/nautilus-directory-async.c:
	(allow_metafile): Add "ghelp:" and "gnome-help:" to the
	unfortunate list of hard-coded schemes. If we hard-code "help:" we
	have to hard-code its synonyms too.
	(find_monitor): Use g_new0 so fields in the Monitor are not
	uninitialized in this case (the fields in question are ignored,
	but it's still nicer this way).
	(nautilus_directory_monitor_add_internal): Set up the "monitor
	hidden files" and "monitor backup files" in the Monitor structure
	based on new parameters.
	(should_display_file_name): Use
	nautilus_file_name_matches_hidden_pattern and
	nautilus_file_name_matches_backup_pattern.
	(monitor_includes_file): New function that encapsulates the rule
	about which monitor includes which file. Handles the new flags for
	not mon...