september 0.45, gnus-server-equal

[Felix Lee <flee@teleport.com>]

symptom:

	when (eq gnus-read-active-file 'some)
	reading the active file only fetches data for a few
	newsgroups that I'm subscribed to.

analysis:

	it's only fetching the groups that are explicitly labelled
	with the method (nntp "my-news-server").

	most of the newsgroups in my gnus-newsrc-assoc were added in
	an earlier era, so they have a method of nil and therefore
	don't get fetched.

comment:

	attaching the method to every item in gnus-newsrc-assoc is
	not very compact.  here's a piece of my gnus-newsrc-assoc:

	(("comp.org.user-groups.apcug" 3 nil nil
	  (nntp "news.teleport.com"
	   (nntp-server-opened-hook
	    (nntp-send-mode-reader nntp-send-authinfo-from-file))
           (nntp-address "news.teleport.com")))
         ("comp.org.user-groups.meetings" 3 nil nil
	  (nntp "news.teleport.com"
	   (nntp-server-opened-hook
	    (nntp-send-mode-reader nntp-send-authinfo-from-file))
           (nntp-address "news.teleport.com")))
         ("comp.org.user-groups.management" 3 nil nil
	  (nntp "news.teleport.com"
	   (nntp-server-opened-hook
	    (nntp-send-mode-reader nntp-send-authinfo-from-file))
           (nntp-address "news.teleport.com")))

	replicate it about 500 more times, and my newsrc.eld file
	becomes a couple megabytes.

	since there are relatively few different methods, it would be
	better to have an external representation more like this:

	( (method-0 group-0-0 group-1-0 ...)
	  (method-1 group-1-0 group-1-1 ...)
	  ... )