
  effect of a change in an otherwise disjoint module.
  Worse yet, the data has been lost and cannot not be now recovered from the archives.
  People are really upset and disappointed with boost (at least the serialization system).
  <p>
  <li>
  After a lot of investigation, it's discovered what the source of the problem
  and class construct_from is marked "track_never" by including:
<code style="white-space: normal"><pre>
BOOST_CLASS_TRACKING(construct_from, track_never) 
</pre></code>
  <li>Now everyth