Add a test for getting raw files via the web UI. [ original upstream description ]

hgweb: nodeids should be aligned in raw changesets If they aren't it breaks hg import --exact Thanks to Jesper Noehr for noticing it. [ original upstream description ]

notify: mime-encode messages - addresses will be properly encoded - message bodies will also be encoded as we are not sending patches that are meant to be applied - update test output - adapt test-keyword to ignore the new headers [ original upstream description ]