* nnagent.el (nnagent-retrieve-headers): Use gnus-sorted-difference.

	* nnagent.el (nnagent-retrieve-headers): Use gnus-sorted-difference.

	* gnus-agent.el (gnus-agent-retrieve-headers): Use
	gnus-sorted-difference.

	* nnsoup.el (nnsoup-request-expire-articles): Use
	gnus-sorted-difference.

	* nnheader.el: Autoload gnus-sorted-difference.

	* nnfolder.el (nnfolder-request-expire-articles): Use
	gnus-sorted-difference.

	* gnus-cache.el (gnus-cache-retrieve-headers): Use
	gnus-sorted-difference.

	* gnus-range.el: Autoload cookies.
	(gnus-sorted-difference): New function.
	(gnus-sorted-ndifference): New function.
	(gnus-sorted-nintersection): Rename from
	gnus-set-sorted-intersection.
	(gnus-sorted-nunion): Rename from gnus-sorted-nunion.
	(gnus-list-range-difference): Rename from
	gnus-inverse-list-range-intersection.
	(gnus-inverse-list-range-intersection): Use defalias.

	* gnus-sum.el (gnus-select-newsgroup): Use gnus-sorted-difference,
	gnus-sorted-ndifference, and gnus-sorted-nintersection.
	(gnus-articles-to-read): Use gnus-sorted-difference.
	(gnus-summary-limit-mark-excluded-as-read): Use
	gnus-sorted-intersection and gnus-sorted-ndifference.
	(gnus-list-of-read-articles): Use gnus-list-range-difference.
	(gnus-summary-insert-articles): Use gnus-sorted-difference.