* elmo-pop3.el (elmo-network-close-session): Removed 3rd argument.

* elmo-pop3.el (elmo-network-close-session): Removed 3rd argument.
(elmo-network-setup-session): Ditto.
(elmo-message-fetch-plugged): Ditto.
(elmo-pop3-send-command): Don't call elmo-pop3-lock.
(elmo-network-initialize-session): Ditto.
(elmo-pop3-read-response): Abolish 3rd argument.
(elmo-pop3-read-response): Don't call elmo-pop3-unlock.
(elmo-pop3-read-contents): Ditto.
(elmo-pop3-read-body): Ditto.
(elmo-folder-status): Call elmo-folder-close.
(elmo-pop3-lock): Abolish.
(elmo-pop3-unlock): Ditto.
(elmo-pop3-locked-p): Ditto.
(elmo-folder-check): Don't call elmo-pop3-locked-p.

* wl-util.el (wl-biff-check-folder): Use own buffer for pop3 biff process.
(wl-biff-check-folder-async): Enclose wl-biff-check-folder with unwind-protect.