Add info about Opera supporting MD5 Authentication.

    <p><strong>Note:</strong> MD5 authentication provides a more

    secure password system than Basic authentication, but only

    works with supporting browsers. As of this writing (July 1999),

    works with supporting browsers. As of this writing (October 2001),

    the only major browsers which support digest authentication are

    <a href="http://www.microsoft.com/windows/ie/">Internet

    Explorer 5.0</a> and <a

    href="http://www.w3.org/Amaya/">Amaya</a>. Therefore, we do not

    recommend using this feature on a large Internet site. However,

    for personal and intra-net use, where browser users can be

    controlled, it is ideal.</p>

    <a href="http://www.opera.com/">Opera 4.0</a>,

    <a href="http://www.microsoft.com/windows/ie/">MS Internet

    Explorer 5.0</a> and <a href="http://www.w3.org/Amaya/">Amaya</a>.

    Therefore, we do not yet recommend using this feature on a large

    Internet site. However, for personal and intra-net use, where

    browser users can be controlled, it is ideal.</p>

    <hr />

    <h2><a id="authdigestfile"