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/site.xsl b/doc/site.xsl
index 5dc28f6..c3539db 100644
--- a/doc/site.xsl
+++ b/doc/site.xsl
@@ -130,6 +130,7 @@
   </xsl:variable>
   <xsl:variable name="api">
     <ul><!-- style="margin-left: -1em" -->
+      <li><a href="APIchunk0.html">Alphabetic</a></li>
       <li><a href="APIconstructors.html">Constructors</a></li>
       <li><a href="APIfunctions.html">Functions/Types</a></li>
       <li><a href="APIfiles.html">Modules</a></li>