[] (0) Make rel=next/prev be non-hierarchical, just sequenced.

git-svn-id: http://svn.whatwg.org/webapps@1126 340c8d12-0b0e-0410-8428-c7bf67bfef74

index

   <a href="#hyperlink1" title="hyperlink link">hyperlink</a>.

  <p>The <code title=rel-next><a href="#next">next</a></code> keyword
   indicates that the document is part of a hierarchical structure, and that
   the link is leading to the document that is the next sibling of the
   current document.
   indicates that the document is part of a sequence, and that the link is
   leading to the document that is the next logical document in the sequence.

  <h6 id=link-type21><span class=secno>4.12.3.19.5. </span>Link type "<dfn
   id=prev title=rel-prev><code>prev</code></dfn>"</h6>
   <a href="#hyperlink1" title="hyperlink link">hyperlink</a>.

  <p>The <code title=rel-prev><a href="#prev">prev</a></code> keyword
   indicates that the document is part of a hierarchical structure, and that
   the link is leading to the document that is the previous sibling of the
   current document.
   indicates that the document is part of a sequence, and that the link is
   leading to the document that is the previous logical document in the
   sequence.

  <p><strong>Synonyms</strong>: For historical reasons, user agents must also
   treat the keyword "<code title="">previous</code>" like the <code

source

  title="hyperlink link">hyperlink</span>.</p>

  <p>The <code title="rel-next">next</code> keyword indicates that the
  document is part of a hierarchical structure, and that the link is
  leading to the document that is the next sibling of the current
  document.</p>
  document is part of a sequence, and that the link is leading to the
  document that is the next logical document in the sequence.</p>


  <h6>Link type "<dfn title="rel-prev"><code>prev</code></dfn>"</h6>
  title="hyperlink link">hyperlink</span>.</p>

  <p>The <code title="rel-prev">prev</code> keyword indicates that the
  document is part of a hierarchical structure, and that the link is
  leading to the document that is the previous sibling of the current
  document.</p>
  document is part of a sequence, and that the link is leading to the
  document that is the previous logical document in the sequence.</p>

  <p><strong>Synonyms</strong>: For historical reasons, user agents
  must also treat the keyword "<code title="">previous</code>" like