* elmo-util.el (elmo-progress-counter-alist): New internal

* elmo-util.el (elmo-progress-counter-alist): New internal
variable.
(elmo-progress-counter-value): New macro.
(elmo-progress-counter-all-value): Ditto.
(elmo-progress-counter-format): Ditto.
(elmo-progress-counter-set-value): Ditto.
(elmo-progress-set): New function.
(elmo-progress-clear): Ditto.
(elmo-progress-notify): Ditto.

* elmo-pipe.el (elmo-pipe-drain): Setup and clear progress
counter.

* elmo.el (elmo-generic-folder-append-messages): Call
`elmo-progress-notify'.
(elmo-folder-move-messages): Don't call `elmo-display-progress'.

* elmo-archive.el (elmo-folder-append-messages): Call
`elmo-progress-notify'.

* elmo-imap4.el (elmo-folder-append-messages): Ditto.

* elmo-localdir.el (elmo-folder-append-messages): Ditto.

* elmo-maildir.el (elmo-folder-append-messages): Ditto.