* riece.el (riece-channel-list-mode): Initialize

* riece.el (riece-channel-list-mode): Initialize
riece-update-buffer-functions.
(riece-user-list-mode): Ditto.

* riece-globals.el (riece-channel-indicator): Rename from
riece-short-channel-indicator.
(riece-long-channel-indicator): Rename from
riece-channel-indicator.

* riece-display.el (riece-update-buffer-functions): Default to
nil.
(riece-update-indicator-functions): New variable splitted from
riece-update-buffer-functions.
(riece-update-channel-indicator): Rename from
riece-update-short-channel-indicator.
(riece-update-long-channel-indicator): Rename from
riece-update-channel-indicator.
(riece-update-buffers): Don't set riece-channel-buffer.
(riece-switch-to-channel): Set riece-channel-buffer here.

* riece-button.el (riece-user-button-popup-menu): Change order.
(riece-button-update-buffer): Unify
riece-button-update-channel-list-buffer and
riece-button-update-user-list-buffer.