* Add support for remembering marked articles in group structure and

* Add support for remembering marked articles in group structure and
  in group init file.  Change server buffer to show which groups
  contain marked articles.  Extend M-x news-read-marked-bodies so that
  it will work from the server buffer, fetching all of the marked
  articles in all of the groups.

* Change group buffer to show threads that have pre-read bodies.

* When marking an article, if it is not being ignored, make sure that
  it is removed from the ignored-subjects database.