* riece-ignore.el (riece-ignore-buffer-name): New user option.

* riece-ignore.el (riece-ignore-buffer-name): New user option.
(riece-ignore-discard-message): Fixed custom spec to follow the
logging option.
(riece-ignore-buffer): New variable.

* riece-log.el (riece-log-display-message-function): Use
riece-format-message.

* riece-message.el (riece-format-message): New function splitted
from riece-display-message-1.
(riece-display-message-1): Use it.