<p>
      <b>PITCON66_PRB6</b> sets up the Freudenstein Roth function, with N = 3,
      and investigates the use of the options for checking the accuracty of
      a user-supplied jacobian.
      This version of the problem demonstrates the jacobian checking option.
      Two runs are made.  Each is allowed only five steps.  The first
      run is with the correct jacobian.  The second run uses a defective
      jacobian, and demonstrates not only the jacobian checker, but also
      shows that "slightly" 