* gnus-group.el (): Require gnus-sum and autoload functions to

	* gnus-group.el (): Require gnus-sum and autoload functions to
	resolve warnings when gnus-group.el compiled alone.
	(gnus-group-line-format): Documented new %F
	(size of Fetched data) group line format; identifies disk space
	used by agent and cache.
	(gnus-group-line-format-alist): Defined new F format.
	(gnus-total-fetched-for): New function.
	(gnus-group-delete-group): No longer update
	gnus-cache-active-altered as gnus-request-delete-group now keeps
	the cache in sync.
	(gnus-group-list-active): Let the agent store a server's active
	list if currently plugged.