* gnus-agent.el (gnus-agent-total-fetched-hashtb): New variable.

	* gnus-agent.el (gnus-agent-total-fetched-hashtb): New variable.
	(gnus-agent-with-refreshed-group): New macro.
	(gnus-agent-rename-group): New function.
	(gnus-agent-delete-group): New function.
	(gnus-agent-save-group-info): Use gnus-command-method when
	`method' parameter is nil.  Don't write nil entries into the
	active file.
	(gnus-agent-get-group-info): New function.
	(gnus-agent-fetch-articles): Use
	gnus-agent-update-files-total-fetched-for to increment disk space
	used.
	(gnus-agent-fetch-headers, gnus-agent-save-alist): Use
	gnus-agent-update-view-total-fetched-for to increment disk space
	used.
	(gnus-agent-get-local): Added optional parameters to avoid calling
	gnus-group-real-name and gnus-find-method-for-group.
	(gnus-agent-set-local): Delete stored entry if either min, or max,
	are nil.
	(gnus-agent-fetch-session): Reworded error/quit messages.  On
	quit, use gnus-agent-regenerate-group to record existance of any
	articles fetched to disk before the quit occurred.
	(gnus-agent-expire-group-1): Use gnus-agent-with-refreshed-group,
	gnus-agent-update-view-total-fetched-for, and
	gnus-agent-update-files-total-fetched-for to decrement disk space
	used.
	(gnus-agent-retrieve-headers): Use
	gnus-agent-update-view-total-fetched-for to increment disk space
	used.
	(gnus-agent-regenerate-group): Replace gnus-group-update-group
	with gnus-agent-update-files-total-fetched-for to decrement disk
	space and fresh group buffer.
	(gnus-agent-inhibit-update-total-fetched-for): New variable.
	(gnus-agent-need-update-total-fetched-for): New variable.
	(gnus-agent-update-files-total-fetched-for): New function.
	(gnus-agent-update-view-total-fetched-for): New function.
	(gnus-agent-total-fetched-for): New function.  * gnus-cache.el
	(gnus-cache-save-buffers): Use
	gnus-cache-update-overview-total-fetched-for to change disk space
	used by this group.
	(gnus-cache-possibly-enter-article): Use
	gnus-cache-update-file-total-fetched-for to increment disk space
	used by this group.
	(gnus-cache-possibly-remove-article): Use
	gnus-cache-update-file-total-fetched-for to decrement disk space
	used by this group.
	(gnus-cache-generate-nov-databases): Purge total fetched cache.
	(gnus-cache-rename-group): New function.
	(gnus-cache-delete-group): New function.
	(gnus-cache-inhibit-update-total-fetched-for): New variable.
	(gnus-cache-need-update-total-fetched-for): New variable.
	(gnus-cache-with-refreshed-group): New macro.
	(gnus-cache-update-file-total-fetched-for): New function.
	(gnus-cache-update-overview-total-fetched-for): New function.
	(gnus-cache-rename-group-total-fetched-for): New function.
	(gnus-cache-delete-group-total-fetched-for): New function.
	(gnus-cache-total-fetched-for): New function.