* wl-draft.el (wl-draft-reply): Use set-buffer-multibyte instead

* wl-draft.el (wl-draft-reply): Use set-buffer-multibyte instead
of elmo-set-buffer-multibyte.

* wl-message.el (wl-original-message-mode): Ditto.

* wl-score.el (wl-score-insert-header): Ditto.

* wl-summary.el
(wl-summary-edit-addresses-collect-candidate-fields): Ditto.
(wl-summary-goto-folder-subr): Ditto.
(wl-summary-insert-headers): Ditto.

* wl-util.el (wl-set-string-width): Ditto.

* bbdb-wl.el (bbdb-wl-get-addresses-1): Use set-buffer-multibyte
instead of elmo-set-buffer-multibyte.
(bbdb-wl-get-addresses-2): Ditto.
(bbdb-wl-update-records): Ditto.
(bbdb-extract-field-value): Ditto.

* elmo-util.el (elmo-set-buffer-multibyte): Abolish.
(elmo-set-work-buf): Use set-buffer-multibyte instead of
elmo-set-buffer-multibyte.
(elmo-object-load): Ditto.
(elmo-save-buffer): Ditto.
(elmo-delete-char): Ditto.
(elmo-file-field-primitive-condition-match): Ditto.
(elmo-mime-string): Ditto.

* elmo-archive.el (elmo-archive-msgdb-create-entity-subr): Ditto.
(elmo-archive-field-condition-match): Ditto.

* elmo-imap4.el (elmo-imap4-setup-send-buffer): Ditto.

* elmo-net.el (elmo-network-initialize-session-buffer): Ditto.

* elmo-nntp.el (elmo-nntp-parse-overview-string): Ditto.
(elmo-nntp-msgdb-create-message): Ditto.

* elmo-pop3.el (elmo-pop3-msgdb-create-message): Ditto.

* elmo.el (elmo-message-match-condition): Ditto.
(elmo-message-match-condition): Ditto.

* modb-entity.el (elmo-msgdb-create-message-entity-from-buffer):
Ditto.

* elmo-util.el (elmo-decoded-field-body): New function.