pre-translation improvements

<summary>

    <p><code>httxt2dbm</code> is used to generate dbm files from text input, for

    use in RewriteMap with the <code>dbm</code> map type.

    use in <directive module="mod_rewrite">RewriteMap</directive>RewriteMap with

    the <code>dbm</code> map type.

    </p>

</summary>

<seealso><program>httpd</program></seealso>

    <dt><code>-v</code></dt>

    <dd>More verbose output</dd>

    <dt><code>-f</code></dt>

    <dt><code>-f <var>DBM_TYPE</var></code></dt>

    <dd>Specify the DBM type to be used for the output. If not specified, will

    use the <glossary>APR</glossary> Default. Available types are:<br />

    <code>GDBM</code> for GDBM files<br />

    <code>SDBM</code> for SDBM files<br />

    <code>DB</code> for berkeley DB files<br />

    <code>NDBM</code> for NDBM files<br />

    default for the default DBM type

    <code>default</code> for the default DBM type

    </dd>

    <dt><code>-i</code></dt>

    <dt><code>-i <var>SOURCE_TXT</var></code></dt>

    <dd>Input file from which the dbm is to be created. The file should be formated

    with one record per line, of the form:<br />

    <code>key value</code><br />

    further details of this file's format and meaning.

    </dd>

    <dt><code>-o</code></dt>

    <dt><code>-o  <var>OUTPUT_DBM</var></code></dt>

    <dd>Name of the output dbm files.</dd>

    </dl>

</section>