applied patch from Stéphane Bidoul to fix some Python bindings

* python/libxml.c python/generator.py python/libxml.py
  python/libxml2-python-api.xml python/libxml2class.txt:
  applied patch from Stéphane Bidoul to fix some Python bindings
  initialization, then had to change the parserCleanup()
  to handle memory released there.
* xmlmemory.c: added more debugging comments.
Daniel
diff --git a/python/generator.py b/python/generator.py
index e0f1096..3ae5729 100755
--- a/python/generator.py
+++ b/python/generator.py
@@ -302,6 +302,8 @@
         return 1
     if name == "xmlFreeParserCtxt":
         return 1
+    if name == "xmlCleanupParser":
+        return 1
     if name == "xmlFreeTextReader":
         return 1
 #    if name[0:11] == "xmlXPathNew":