* spam.el (spam-check-ifile, spam-ifile-register-with-ifile)

* spam.el (spam-check-ifile, spam-ifile-register-with-ifile)
(spam-ifile-register-spam-routine)
(spam-ifile-register-ham-routine): added ifile functionality that
does not use ifile-gnus.el to classify and register articles
(spam-get-article-as-string): convenience function
(spam-summary-prepare-exit): added ifile spam and ham registration
(spam-ifile-all-categories, spam-ifile-spam-category)
(spam-ifile-path, spam-ifile): added customization options

* gnus.el (gnus-group-ham-exit-processor-ifile): added ifile ham
exit processor
(spam-process): added gnus-group-ham-exit-processor-ifile to the
list of choices