preparing release 2.4.27 updated and rebuilt the docs try to make sure the

* configure.in: preparing release 2.4.27
* doc/* : updated and rebuilt the docs
* doc/Makefile.am libxml.spec.in: try to make sure the tutorial
  and all the docs are actually packaged and in the final RPMs
* parser.c parserInternals.c include/libxml/parser.h: restore
  xmllint --recover feature.
Daniel
diff --git a/libxml.spec.in b/libxml.spec.in
index 35e0c6c..67f5395 100644
--- a/libxml.spec.in
+++ b/libxml.spec.in
@@ -115,6 +115,7 @@
 %doc %{_mandir}/man1/xml2-config.1*
 %doc AUTHORS ChangeLog NEWS README Copyright TODO
 %doc doc/*.html doc/html doc/*.gif doc/*.png
+%doc doc/tutorial
 
 %{_libdir}/lib*.so
 %{_libdir}/*a