Test wrapper classes from the Python module.

Write test Python programs (maybe look that the tutorial or
the Gtk distribution).  A large set of programs would be
very useful in testing the bindings.

Find a general solution to callback problem.  Much is this
trouble comes from the fact that C can't handle higher-order
functions.  I am curious how Perl-Gtk or Guile-Gtk handles this.

Make sure reference counting is working on both the Python and
Gtk side.  Plug memory leaks.

Use funky features of Python to make Python-Gtk nice to program
with.  Examples: use __getitem__, etc. for List object.  Replace
menu factory with something done nicely in Python.
