modified the file header to add more informations, painful... updated to

* include/libxml/*.h include/libxml/*.h.in: modified the file
  header to add more informations, painful...
* genChRanges.py genUnicode.py: updated to generate said changes
  in headers
* doc/apibuild.py: extract headers, add them to libxml2-api.xml
* *.html *.xsl *.xml: updated the stylesheets to flag geprecated
  APIs modules. Updated the stylesheets, some cleanups, regenerated
* doc/html/*.html: regenerated added back book1 and libxml-lib.html
Daniel
diff --git a/include/libxml/xpath.h b/include/libxml/xpath.h
index dbd1b77..5172e93 100644
--- a/include/libxml/xpath.h
+++ b/include/libxml/xpath.h
@@ -1,12 +1,19 @@
 /*
- * xpath.c: interface for XML Path Language implementation
+ * Summary: XML Path Language implementation
+ * Description: API for the XML Path Language implementation
  *
- * Reference: W3C Working Draft 5 July 1999
- *            http://www.w3.org/Style/XSL/Group/1999/07/xpath-19990705.html
+ * XML Path Language implementation
+ * XPath is a language for addressing parts of an XML document,
+ * designed to be used by both XSLT and XPointer
+ *     http://www.w3.org/TR/xpath
  *
- * See COPYRIGHT for the status of this software
+ * Implements
+ * W3C Recommendation 16 November 1999
+ *     http://www.w3.org/TR/1999/REC-xpath-19991116
  *
- * Author: daniel@veillard.com
+ * Copy: See Copyright for the status of this software.
+ *
+ * Author: Daniel Veillard
  */
 
 #ifndef __XML_XPATH_H__