Separate out old-http support - create new statichttprepo class - pull remote bits out of localrepo - pull remote bits out of util.opener - switch hg.repository to use statichttprepo

#header#
    <title>#repo|escape#: #file# history</title>
    <description>#file# revision history</description>
    #entries%filelogentry#
  </channel>
</rss>