* spam.el (spam-blacklist-ignored-regexes): new variable, so

* spam.el (spam-blacklist-ignored-regexes): new variable, so
blacklisting can ignore certain regular expressions (e.g. the
user's e-mail address)
(spam-bogofilter-spam-strong-switch,
spam-bogofilter-ham-strong-switch): options used when articles are
already registered as the opposite classification
(spam-old-ham-articles, spam-old-spam-articles): lists of ham and
spam articles, generated when a summary buffer is entered, and
consulted when it's exited so we know what articles are changing
state from spam to ham or vice-versa
(spam-xor): everyone needs a little convenience
(spam-list-of-processors): lookup table for old-style spam/ham
exits processors
(spam-group-processor-p): support old-style and new-style spam/ham
exit processors
(spam-group-processor-multiple-p): handle new-style spam/hamn exit
processors
(spam-summary-prepare): use spam-old-{ham,spam}-articles; change
logic to iterate over list of processors instead of manual
individual lookup, unregister any articles that change from ham to
spam or vice-versa in the course of the summary buffer usage; use
the new spam-register-routine
(spam-ham-copy-routine, spam-ham-move-routine,
spam-mark-spam-as-expired-and-move-routine): check that the list
of groups is not nil, because apply doesn't like to apply a
function across nil
(spam-registration-functions): variable for looking up spam/ham
registration/unregistration functions based on a spam-use-* symbol
(spam-classification-valid-p, spam-process-type-valid-p)
(spam-registration-check-valid-p)
(spam-unregistration-check-valid-p): convenience functions
(spam-registration-function, spam-unregistration-function): look
up the registration/unregistration function based on a
classification and the check (spam-use-* symbol)
(spam-list-articles): generate list of spam/ham articles from a
given list of articles
(spam-register-routine): do the heavy work of registering and
unregistering articles, using all the articles in the group or
specific ones as needed
(spam-generic-register-routine): removed, no longer used
(spam-log-unregistration-needed-p, spam-log-undo-registration):
handle article registration/unregistration with a given spam/ham
processor and group
(BBDB, ifile, spam-stat, blacklists, whitelists, spam-report,
bogofilter, spamoracle): rewrite registration/unregistration
functions to take a list of articles and the unregister option.
Much hilarity ensues.

* spam-stat.el (spam-stat-dirty): new variable, set when the stats
database is modified
(spam-stat-buffer-is-spam, spam-stat-buffer-is-non-spam)
(spam-stat-buffer-change-to-spam, spam-stat-to-hash-table)
(spam-stat-buffer-change-to-non-spam): set spam-stat-dirty when
needed
(spam-stat-save): respect spam-stat-dirty, unless the force
parameter is specified
(spam-stat-load): clear spam-stat-dirty

* gnus.el (gnus-install-group-spam-parameters): marked the
old-style exit processors as obsolete in the docs, added the
new-style exit processors while the old ones are still allowed