* riece-filter.el (riece-handle-numeric-reply): Don't decode messages.

* riece-filter.el (riece-handle-numeric-reply): Don't decode messages.
(riece-handle-message): Ditto.
(riece-sentinel): Clear system here.

* riece-server.el (riece-server-process-name): New function.
(riece-server-process): New function.
(riece-close-server): Abolish.

* riece-identity.el: Adopt vector object representation for
identity objects.
(riece-with-identity-buffer): New macro.
(riece-decode-identity): New function.
(riece-encode-identity): New function.

* riece-channel.el: Assume that we are already in the server buffer.
* riece-user.el: Likewise.