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/news.html b/doc/news.html
index 23de592..3ed114f 100644
--- a/doc/news.html
+++ b/doc/news.html
@@ -105,6 +105,20 @@
   Schemas</a>
 </li>
 </ul>
+<h3>2.5.4: Feb 20 2003</h3>
+<ul>
+<li>Conformance testing and lot of fixes on Relax NG and XInclude
+    implementation</li>
+  <li>Implementation of XPointer element() scheme</li>
+  <li>Bug fixes: XML parser, XInclude entities merge, validity checking on
+    namespaces,
+    <p>2 serialization bugs, node info generation problems, a DTD regexp
+    generation problem.</p>
+  </li>
+  <li>Portability: windows updates and path canonicalization (Igor)</li>
+  <li>A few typo fixes (Kjartan Maraas)</li>
+  <li>Python bindings generator fixes (Stephane Bidoul)</li>
+</ul>
 <h3>2.5.3: Feb 10 2003</h3>
 <ul>
 <li>RelaxNG and XML Schemas datatypes improvements, and added a first