* riece-options.el (riece-channel-history-length): New user option.

* riece-options.el (riece-channel-history-length): New user option.
(riece-connection-timeout): Abolish.

* riece-globals.el (riece-channel-history): New variable.
(riece-last-channel): Abolish.

* riece-display.el: Autoload ring-insert.
(riece-switch-to-channel): Update riece-channel-history.
(riece-switch-to-nearest-channel): Ditto.

* riece-server.el (riece-clear-system): Abolish.
* riece.el (riece-exit): Merge riece-clear-system.
(riece): Initialize riece-channel-history.