Changes:
* Fix up a duplicate symbol bug in the atk module, that was causing
build problems on MacOS X (hopefully the last such problem).
* add gtk.glade.set_custom_handler() API, that provides more info to
the custom widget callback. Deprecate set_custom_widget_callbacks().
* some other bug fixes.
changes include:
* Threading support is compiled in by default now. It is necessary
to call gtk.threads_init() in order to make use of threading
though. There have been a number of fixes to the threading
support too.
* Fix up some problems with multiple definitions of global variables
in gobject module, that was causing problems on Mac OS X.
* Wrappers for many new APIs (John Finlay, Naofumi Yasufuku, Johan
Dahlin and others).
* Improvements to the code generator to give better error messages.
* Some fixes to property APIs to work correctly on 64 bit systems,
and to handle ATOM type properties.
* Fix copyright headers on source files.
