preparing release 2.5.4 updated and rebuilt the docs removed warnings

* configure.in: preparing release 2.5.4
* doc/*: updated and rebuilt the docs
* relaxng.c: removed warnings
* result/relaxng/*: updated the results
Daniel
diff --git a/doc/contribs.html b/doc/contribs.html
index ab62833..5c149af 100644
--- a/doc/contribs.html
+++ b/doc/contribs.html
@@ -136,14 +136,10 @@
     Digital Signature</a> <a href="http://www.aleksey.com/xmlsec/">implementations for libxml2</a>
 </li>
   <li>
-<a href="mailto:Steve.Ball@zveno.com">Steve Ball</a>,
-    <a href="http://www.zveno.com/">Zveno</a> and contributors maintain
-    <a href="http://tclxml.sourceforge.net/">tcl bindings for libxml2 and libxslt</a>, as well as 
-    <a href="http://tclxml.sf.net/tkxmllint.html">tkxmllint</a> a GUI for
-    xmllint and
-    <a href="http://tclxml.sf.net/tkxsltproc.html">tkxsltproc</a> a GUI for
-    xsltproc.
-</li>
+<a href="mailto:Steve.Ball@zveno.com">Steve Ball</a>, <a href="http://www.zveno.com/">Zveno</a> and contributors maintain <a href="http://tclxml.sourceforge.net/">tcl bindings for libxml2 and
+    libxslt</a>, as well as <a href="http://tclxml.sf.net/tkxmllint.html">tkxmllint</a> a GUI for
+    xmllint and <a href="http://tclxml.sf.net/tkxsltproc.html">tkxsltproc</a>
+    a GUI for xsltproc.</li>
 </ul>
 <p></p>
 <p><a href="bugs.html">Daniel Veillard</a></p>