* elsp-bsfilter.el (elmo-spam-bsfilter-max-files-per-process)

* elsp-bsfilter.el (elmo-spam-bsfilter-max-files-per-process)
(elmo-spam-bsfilter-max-messages-per-process): New use option.
(elmo-spam-bsfilter-debug): Fix a group.
(elsp-bsfilter-call-bsfilter): Don't use `delq' and add option
`--homedir'.
(elmo-spam-buffer-spam-p): Don't specify `--homedir' option.
(elsp-bsfilter-list-spam-files): New function.
(elmo-spam-list-spam-messages): Define.
(elsp-bsfilter-register-buffer): Add an optional argument `mbox'.
(elmo-spam-bsfilter-register-messages): New function.
(elmo-spam-register-spam-messages): Define.
(elmo-spam-register-good-messages): Ditto.

* elmo-spam.el (elmo-spam-process-messages-as-mbox): New function.