test/css2.1/harness: Fixed broken link to lxml installation instructions

Author: rhauck

test/css2.1/harness.txt

@@ -6,7 +6,7 @@ The CSS2.1 Test Suite's final format is generated from the XHTML 1.1 source file
 
   * Python 2.6 or 2.7 (2.6 preferred for OS X 10.6, 2.7 preferred for OS X 10.7) (note ucs4 support is required, on OSX, use 'port install python26 +ucs4' or 'port install python27 +ucs4' to install)
   * The [[http://tt2.org/python/|Template-Python module]] (Note that the SVN command on that page is incorrect; it should be ''svn co svn:/''''/svn.tt2.org/tt/Template-Python/trunk Template-Python'')
-  * The [[http://codespeak.net/lxml/installation.html|lxml Python module]]
+  * The [[http://lxml.de/installation.html|lxml Python module]]
   * A [[http://test.csswg.org/source/tools/w3ctestlib/html5lib.patch|patched]] copy of the Python [[http://code.google.com/p/html5lib/|html5lib]] module
   * Perl 5
   * [[http://mercurial.selenic.com/|Mercurial]] (for building as well as cloning)
@@ -27,4 +27,4 @@ The w3ctestlib/ folder is a subrepo. To write to it, add to tool/w3ctestlib/.hg/
   [paths]
   default-push = https://hg.csswg.org/dev/w3ctestlib
 
-and make sure you commit and push first inside w3ctestlib (to update the subrepo), then above it in the test repository (to update the test repository's versioned link to the subrepo).
+and make sure you commit and push first inside w3ctestlib (to update the subrepo), then above it in the test repository (to update the test repository's versioned link to the subrepo).