* wl-refile.el (wl-refile-learn): Don't use msgdb.

* wl-refile.el (wl-refile-learn): Don't use msgdb.
(wl-refile-msgid-learn): Ditto.
(wl-refile-get-field-value): Ditto.

* wl-mime.el (wl-mime-combine-message/partial-pieces): Don't use msgdb.

* wl-expire.el (wl-expire-message-p): Renamed from wl-expire-msg-p.
(wl-expire-delete-reserved-messages): Renamed from
wl-expire-reserve-marked-msgs-from-list.
(wl-expire-delete): Removed argument `msgdb'.
(wl-expire-refile): Ditto.
(wl-expire-refile-with-copy-reserve-msg): Ditto.
(wl-expire-archive-number-delete-old): Ditto; Use folder instead of
mark-alist as argument.
(wl-expire-archive-number1): Removed argument `msgdb'.
(wl-expire-archive-number2): Ditto.
(wl-expire-archive-date): Ditto.
(wl-expire-localdir-date): Ditto.
(wl-expire-hide): Ditto.
(wl-archive-number1): Ditto.
(wl-archive-number2): Ditto.
(wl-archive-date): Ditto.
(wl-archive-folder): Ditto.
All other related portions are changed.