* riece-identity.el (riece-coding-system-for-identity): Moved from

* riece-identity.el (riece-coding-system-for-identity): Moved from
riece-coding.el.
(riece-decoded-string-for-identity): Ditto.

* riece-300.el (riece-handle-322-message): Decode message per
channel.
(riece-handle-set-topic): Ditto.

* riece-handle.el (riece-handle-notice-message): Decode message
per channel.
(riece-handle-part-message): Ditto.
(riece-handle-kick-message): Ditto.
(riece-handle-topic-message): Ditto.