* liece-channel.el (liece-channel-redisplay-buffer): New hook

* liece-channel.el (liece-channel-redisplay-buffer): New hook
`liece-channel-read-hook'.
(liece-channel-change): Run `liece-redisplay-unread-mark'.

* liece-handle.el (liece-handle-privmsg-message): New hook
`liece-channel-unread-hook'.

* liece-vars.el (liece-display-unread-mark): New variable.

* liece-xemacs.el (liece-xemacs-unread-icon): Rename from
`liece-xemacs-channel-balloon-icon'.
(liece-xemacs-unread-mark): Rename and simplified from
`liece-xemacs-channel-balloon'.
(liece-xemacs-read-mark): Rename and simplefied from
`liece-xemacs-channel-balloon-kill'.
(liece-xemacs-redisplay-unread-mark): New function.
(toplevel): Add them to hook.

* liece-emacs.el (liece-emacs-unread-character): New variable.
(liece-emacs-unread-mark): New function.
(liece-emacs-read-mark): Ditto.
(liece-emacs-redisplay-unread-mark): Ditto.
(toplevel): Add them to hook.