* wl-mime.el (wl-message-delete-current-part): Check the class of mime-entity.

* wl-mime.el (wl-message-delete-current-part): Check the class of mime-entity.

* wl-draft.el (wl-draft-reedit): Set wl-draft-parent-folder.

* wl-draft.el (wl-draft-parent-number): New buffer local variable.
(wl-draft-reply): Added optional argument `number';
Set wl-draft-parent-number.
(wl-draft-kill): Delete answered mark if it is a reply.

* elmo.el (elmo-folder-unmark-important): Follow the changes above.
(elmo-folder-mark-as-important): Ditto.
(elmo-folder-unmark-read): Ditto.
(elmo-folder-mark-as-read): Ditto.
(elmo-folder-unmark-answered): Ditto.
(elmo-folder-mark-as-answered): Ditto.

* elmo-msgdb.el (elmo-msgdb-set-cached): Use the term 'flag' for
message status.
(elmo-msgdb-mark): Likewise.
(elmo-msgdb-set-flag): Renamed from elmo-msgdb-set-status.
(elmo-msgdb-unset-flag): Likewise.

* elmo.el (elmo-generic-folder-diff): Avoid byte-compile warning.