* wl.el (toplevel): Require wl-spam when compile.

* wl.el (toplevel): Require wl-spam when compile.
(wl-save-status): Call wl-spam-save-status.

* wl-spam.el (wl-spam-register-spam-messages): New function.
(wl-spam-register-good-messages): Ditto.
(wl-spam-save-status): Ditto.
(wl-summary-mode-map): Bind
wl-summary-target-mark-register-as-spam to "ms" and
wl-summary-target-mark-register-as-good to "mn".
(wl-summary-register-as-spam): Abolish optional argument; Use
wl-spam-register-spam-messages.
(wl-summary-register-as-spam-all): Use
wl-spam-register-spam-messages.
(wl-summary-register-as-good): Abolish optional argument; Use
wl-spam-register-good-messages.
(wl-summary-register-as-good-all): Use
wl-spam-register-good-messages.
(wl-summary-target-mark-register-as-spam): New funtion.
(wl-summary-target-mark-register-as-good): Ditto.

* elmo-spam.el (elmo-spam-save-status): New API.

* elsp-spamfilter.el: New file.

* WL-ELS (ELMO-MODULES): Added elsp-spamfilter only if spamfilter
is installed.