* <li>[md5] SET_SOURCE_COVER [source], [luid]: set the default cover for the
* given source to the cover of the story denoted by luid</li>
* <li>[md5] CHANGE_SOURCE [luid] [new source]: change the source of the story
* <li>[md5] SET_SOURCE_COVER [source], [luid]: set the default cover for the
* given source to the cover of the story denoted by luid</li>
* <li>[md5] CHANGE_SOURCE [luid] [new source]: change the source of the story