The encoding.html page was generated incorectly, revamp the input
xml.html and convert the full XSLT chain to use and serve it as
UTF-8
* doc/*: fix xml.html, update all stylesheets and regenerate
* valid.c: fixed a weird error where validity context whould not
show up if warnings were disabled pointed out by Bob Stayton
* xmlIO.c doc/generator.py: cleanup and fix to regenerate the docs
* doc//* testapi.c: rebuilt the docs
Daniel
* libxml.spec.in doc/devhelp/*: finished the integration with
devhelp, completing the index and inserted into the gtk-doc
database at "make install" stage
Daniel
