* gnus-agent.el (gnus-agent-expire-days):

	* gnus-agent.el (gnus-agent-expire-days):
	gnus-request-move-article depends on gnus-agent-expire to clean up
	the cache after moving the article.  Therefore, g-a-e-d can NOT
	default to nil or can gnus-agent-expire be disabled by doing so.
	If you don't want to run gnus-agent-expire, don't call it.
	(gnus-agent-expire): The broken test to disable gnus-agent-expire
	when g-a-e-d was NOT nil was removed.
	(gnus-agent-article-name): Removed unnecessary input test as
	article IDs are always strings.
	(gnus-agent-regenerate-group): Added check to protect against
	servers that generate absurdly long article IDs.  Valid IDs are
	less than 10 digits to avoid overflow errors.  Fixed logic error
	when ensuring that the final article ID is present in the new
	alist.