finished the integration with devhelp, completing the index and inserted

* 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
diff --git a/libxml.spec.in b/libxml.spec.in
index 3f687e4..16c9888 100644
--- a/libxml.spec.in
+++ b/libxml.spec.in
@@ -131,6 +131,10 @@
 %doc doc/*.html doc/html doc/*.gif doc/*.png
 %doc doc/tutorial doc/libxml2-api.xml.gz
 %doc doc/examples
+%doc %{_datadir}/gtk-doc/html/libxml2/*.devhelp
+%doc %{_datadir}/gtk-doc/html/libxml2/*.html
+%doc %{_datadir}/gtk-doc/html/libxml2/*.png
+%doc %{_datadir}/gtk-doc/html/libxml2/*.css
 
 %{_libdir}/lib*.so
 %{_libdir}/*a