        <span class="code">get_extension</span> to <span class="code">get_extension_list</span>.
            </li>
            <li>The calling signature has changed. Instead of an archive database
                and a stats database being passed in, a single <em>database lookup
                    function</em> is passed in.
            </li>
            <li>The name of the top-level class in the tag chain has changed from
                <span class="code">TimeSpanStats</span> to <span class="code">Timesp