Added capability to transform Docbook footnotes

Exepected docbook content:

  <footnote><simpara>lorem dufus ipsem</simpara></footnote>

  Apparent ODF result:

  <text:note text:id="ftn0" text:note-class="footnote">
    <text:note-citation>1</text:note-citation>
    <text:note-body>
      <text:p text:style-name="Footnote">
        <text:span text:style-name="Default">lorem dufus ipsem</text:span>
      </text:p>
    </text:note-body>
  </text:note>
trigger for footnote processing
Added ability to use 'page-break' version of style for first section
See xsl/document-content/section.xsl to enable.
fixed typo
fixed typos
added handling of DocBook phrase
added missing include for footnote handling
added default font for footnotes
added page layout for US Letter