download URLs can now be marked with 'rel="download"' and
'rel="homepage"' respectively, and the 'Index of Packages' string is no
longer required.  Since PyPI doesn't yet support rel="" attributes, the
old "<th>"-matching code remains, as does the MD5 scraping.
(backport from trunk)

--HG--
branch : setuptools-0.6
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4050557