lxml instead of libxml2 for c2p, google app engine supports lxml and generally better supported
empty line made quality test fail
apply_xsl real doctest instead of just usage example
doctest_depends_on added, doctest corrected
tested from within vim line-by-line over more files and missed import line in this file
Merge pull request #2029 from rpuntaie/lxml_insteadof_libxml2

lxml instead of libxml2 for c2p