preparing 2.4.18 updated and rebuilt the web site implement the new

* configure.in: preparing 2.4.18
* doc/*: updated and rebuilt the web site
* *.c libxml.h: implement the new IN_LIBXML scheme discussed with
  the Windows and Cygwin maintainers.
* parser.c: humm, changed the way the SAX parser work when
  xmlSubstituteEntitiesDefault(1) is set, it will then
  do the entity registration and loading by itself in case the
  user provided SAX getEntity() returns NULL.
* testSAX.c: added --noent to test the behaviour.
Daniel
diff --git a/doc/xml.html b/doc/xml.html
index b38ccdb..45a7872 100644
--- a/doc/xml.html
+++ b/doc/xml.html
@@ -556,6 +556,16 @@
     href="http://www.w3.org/TR/xinclude">XInclude</a></li>
 </ul>
 
+<h3>2.4.18: Mar 18 2002</h3>
+<ul>
+  <li>bug fixes: tree, SAX, canonicalization, validation, portability,
+  xpath</li>
+  <li>removed the --with-buffer option it was becoming unmaintainable</li>
+  <li>serious cleanup of the Python makefiles</li>
+  <li>speedup patch to XPath very effective for DocBook stylesheets</li>
+  <li>Fixes for Windows build, cleanup of the documentation</li>
+</ul>
+
 <h3>2.4.17: Mar 8 2002</h3>
 <ul>
   <li>a lot of bug fixes, including "namespace nodes have no parents in
@@ -2528,6 +2538,8 @@
     }
     return(ret); <br>
 
+
+
 } </pre>
   </li>
   <li>And then use it to save the document: