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
7 files changed