Usage: <tt>input = [<i>etol ignoreE</i>] totalsteps = <i>N</i> timestep = &Delta; steepest_descent_relax </tt>

<p>
Perform steepest descent relaxation for a maximum of <tt><i>N</i></tt> steps with step
size &Delta;.  The relaxation will exit if the reduction of <tt>EPOT</tt> is
less than <tt><i>etol</i></tt>.  The <tt>EPOT</tt> will not be monitored if 
<tt><i>ignoreE</i> = 1</tt>.

<p>
For debugging/testing purposes.  Much slower than <tt>relax</tt>, which uses the conjugate
gradient algorithm.
