more work, now able to extend the XPath interpreter with functions written

* python/Makefile.am python/generator.py python/libxml.c
  python/libxml.py: more work, now able to extend the
  XPath interpreter with functions written in python.
Daniel
diff --git a/python/libxml.py b/python/libxml.py
index 476bb27..88be5d7 100644
--- a/python/libxml.py
+++ b/python/libxml.py
@@ -142,6 +142,12 @@
     return o
 
 #
+# register an XPath function
+#
+def registerXPathFunction(ctxt, name, ns_uri, f):
+    ret = _libxml.registerXPathFunction(ctxt, name, ns_uri, f)
+
+#
 # Everything below this point is automatically generated
 #