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/xmlerror.h b/include/libxml/xmlerror.h
index 3532023..648ddff 100644
--- a/include/libxml/xmlerror.h
+++ b/include/libxml/xmlerror.h
@@ -1,3 +1,12 @@
+/*
+ * Summary: error handling
+ * Description: the API used to report errors
+ *
+ * Copy: See Copyright for the status of this software.
+ *
+ * Author: Daniel Veillard
+ */
+
 #include <libxml/parser.h>
 
 #ifndef __XML_ERROR_H__