Call `spam-initialize' automatically

* spam.el (spam-initialize): Allow calling repeatedly, but only run the
the code once (bug#9069).

* gnus-sum.el (gnus-summary-read-group-1): Initialize the spam code if
that's needed.
Restore fancy split match data reliably

* nnmail.el (nnmail-split-it): Instead of redoing the search to restore
the match data, just save and restore it explictly (bug#12375).
Fix stale summary buffer name when using a single article buffer

* gnus-art.el (gnus-article-setup-buffer): Refresh the summary buffer
name if we're using a single article buffer.  Otherwise, it may point
to a killed buffer (bug#13756).
* gnus-salt.el (gnus-tree-highlight-article): Don't move point around
in the summary buffer (bug#13769).
Change last patch to Dave Abraham's original code to avoid warning
* gnus-tut.txt (Message-ID): Typo fix (bug#15556).
lpath.el: Fbind spam-initialize for XEmacs
* nnimap.el (nnimap-transform-headers): Fix Davmail header parsing.
Partially revert mistakenly checked-in test code from last checkin
Ma Gnus v0.9 is released
Ma Gnus v0.10 is begun
Remove gnus-setup.el

* gnus-setup.el: Remove outdated file.
Remove all mentions of w3

w3 hasn't been updated in a decade, and is probably not used a lot any
more.  And both w3m and shr offer more updated HTML rendering support.

Also remove url.el checks from the build process, since all Emacs
targets that Ma Gnus builds against have url.el build-in.
* gnus.texi: w3 is no longer supported by Gnus.
Add support for random Face headers

* gnus-fun.el (gnus-x-face-omit-files): Regexp to omit matched results
from random face commands.
(gnus-face-directory): Like `gnus-x-face-directory` for png files and
Face.
(gnus-face-omit-files): Like `gnus-x-face-omit-files` for Face.
(gnus--random-face-with-type): Generic function returning a face-type
as a string.
(gnus--insert-random-face-with-type): Generic function inserting a face
in a message buffer header.
(gnus-random-x-face): Rewritten to use `gnus--random-face-with-type`.
(gnus-insert-random-x-face-header): Rewritten to use
`gnus--insert-random-face-with-type`.
(gnus-random-face): Return random (png) Face as string.
(nus-insert-random-face-header): Insert random (png) Face in a message
buffer.
Flush dns.el data if the network interfaces change

* dns.el (dns-servers-up-to-date-p): New function to see whether the
network interfaces changed.
(dns-query): Use it to flush the data.
* gnus-sum.el (gnus-summary-open-group-with-article): New command.
Allow specifying what headers to include when forwarding messages

* lisp/message.el (message-remove-header): Doc fix.
(message-forward-included-headers): New variable.
(message-remove-ignored-headers): Use it.

* texi/message.texi (Forwarding): Mention
`message-forward-included-headers'.
Allow using `gnus-parameters' while splitting mail

* gnus-mlspl.el (gnus-group-split-fancy): Use `gnus-parameters' in
`gnus-group-split-fancy'.
Allow using `gnus-parameters' while splitting mail

* gnus-mlspl.el (gnus-group-split-fancy): Use `gnus-parameters' in
`gnus-group-split-fancy'.