New in 3.0.5: Detail file reader tracking

[Alan DeKok]

  This is a feature which people have been asking about for a long time.
 It's finally here in 3.0.5.

  When configured with "track = yes", the detail file reader will track
its progress through the detail file.  When it has successfully read and
processed an entry from the file, that entry is marked as "done".

  That means if the server is restarted, it will quickly scan through
the detail file, and ignore the records marked "done".  It will then
continue processing the next (unfinished) entry.

  This change means that detail file entries will be processed once, and
only once.  It also means that the server will make progress through the
detail files much more quickly when it's restarted.

  Alan DeKok.