generated an alphabetic index based on comments content rebuilt the web

* doc/APIchunk*.html doc/parsedecl.py doc/api.xsl: generated
  an alphabetic index based on comments content
* doc/*: rebuilt the web site with the new references
Daniel
diff --git a/doc/libxml2-api.xml b/doc/libxml2-api.xml
index 454f256..16e5e8d 100644
--- a/doc/libxml2-api.xml
+++ b/doc/libxml2-api.xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="ISO-8859-1"?>
 <api name='libxml2'>
   <files>
     <file name='debugXML'>