* riece-addon.el (riece-addon-list-unsupported-face): Abolished.

* riece-addon.el (riece-addon-list-unsupported-face): Abolished.
(riece-addon-list-mark-face-alist): Removed unsupported mark.
(riece-enable-addon): Add-on modules are not needed to provide
riece-*-enable any more.
(riece-disable-addon): Add-on modules are not needed to provide
riece-*-disable any more.
(riece-command-list-addons): Don't display unsupported mark.