[Python-3000] PyObject_HEAD_INIT

[Roger Binns]

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Something has been baffling me and is still present in py3.0 -rc2.

When initializing a (non-variable) PyTypeObject in Python 2,
PyObject_HEAD_INIT is used.  The docs for Python 3 still show that:

  http://docs.python.org/dev/3.0/extending/newtypes.html

However if you try to use it you get all sorts of severe warnings (it
looks like structure members don't line up).  Looking through the Python
3.0 source, *all* initialization is done using
PyVarObject_HEAD_INIT(NULL, 0) instead - PyObject_HEAD_INIT is not used
at all.  The Python 2.3 source shows the latter form being used almost
exclusively so at some point someone changed a lot of code.

It would seem that common practise, the examples and the documentation
don't all match each other!

Roger
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