* <li>[md5] DELETE_STORY [luid]: delete the story of LUID luid</li>
* <li>[md5] GET_COVER [luid]: return the cover of the story</li>
* <li>[md5] GET_SOURCE_COVER [source]: return the cover for this source</li>
* <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] DELETE_STORY [luid]: delete the story of LUID luid</li>
* <li>[md5] GET_COVER [luid]: return the cover of the story</li>
* <li>[md5] GET_SOURCE_COVER [source]: return the cover for this source</li>
* <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>