* gnus.el (spam-process, spam-autodetect-methods): Add

* gnus.el (spam-process, spam-autodetect-methods): Add
bsfilter and bsfilter-headers.

* spam.el (spam-bsfilter): New customize group.
(spam-use-bsfilter, spam-use-bsfilter-headers, spam-bsfilter-path)
(spam-bsfilter-header, spam-bsfilter-probability-header)
(spam-bsfilter-spam-switch, spam-bsfilter-ham-switch)
(spam-bsfilter-spam-strong-switch, spam-bsfilter-ham-strong-switch)
(spam-bsfilter-database-directory): New options.
(spam-install-hooks, spam-list-of-processors, spam-list-of-checks)
(spam-list-of-statistical-checks, spam-registration-functions):
Add `spam-use-bsfilter' and `spam-use-bsfilter-headers'.
(spam-bsfilter-score): New command.
(spam-check-bsfilter-headers, spam-check-bsfilter)
(spam-bsfilter-register-with-bsfilter)
(spam-bsfilter-register-spam-routine)
(spam-bsfilter-unregister-spam-routine)
(spam-bsfilter-register-ham-routine)
(spam-bsfilter-unregister-ham-routine): New functions.
(spam-generic-score): Supprt bsfilter; Accept an optional argument
to recalcurate spam score even if scoring header has already been
added.
(spam-bogofilter-score, spam-spamassassin-score): Accept an
optional argument to recalcurate spam score even if scoring header
has already been added.