* elmo-msgdb.el: Rewrite with luna.

* elmo-msgdb.el: Rewrite with luna.

* elmo.el (elmo-folder-msgdb-load): Renamed from `elmo-msgdb-load'.
(elmo-folder-msgdb): Follow the change above.
(elmo-generic-folder-commit): Use `elmo-msgdb-save'.
(elmo-folder-unmark-important): Follow the API change.
(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-folder-clear): Likewise.

* elmo-imap4.el (elmo-folder-open): Use `elmo-folder-msgdb-load'
instead of `elo-msgdb-load' (renamed).