* wl-spam.el (wl-spam-domain): Renamed from

* wl-spam.el (wl-spam-domain): Renamed from
`wl-spam-folder-guess-domain'.
(wl-summary-exec-action-spam): Register as spam if domain of the
source folder is good.
(wl-summary-exec-action-refile-with-register): Register message if
domain of the source folder is not undecided.

* elsp-spamfilter.el (elsp-spamfilter-decode-buffer): Renamed from
`elmo-spam-spamfilter-decode-buffer'.
(elsp-spamfilter-register-buffer-internal): New internal function.
(elmo-spam-buffer-spam-p): Use it; Follow the API change.
(elmo-spam-register-spam-buffer): Ditto.
(elmo-spam-register-good-buffer): Ditto.

* elsp-bogofilter.el (elmo-spam-buffer-spam-p): Follow the API
change.
(elmo-spam-bogofilter-register-buffer): Added argument `restore'.
(elmo-spam-register-spam-buffer): Follow the API change.
(elmo-spam-register-good-buffer): Ditto.

* elmo-split.el (toplevel): Require elmo-spam when copmile.
(elmo-split-spam-p): Added argument plist; Call
`elmo-spam-buffer-spam-p' with new argument register.

* elmo-spam.el (elmo-spam-buffer-spam-p): Added optional argument
`register'.
(elmo-spam-message-spam-p): Ditto.
(elmo-spam-register-spam-buffer): Added optional argument
`restore'.
(elmo-spam-register-good-buffer): Ditto.
(elmo-spam-register-spam-messages): Ditto.
(elmo-spam-register-good-messages): Ditto.