Third party module porting notes

[Toshio Kuratomi]

Someone on the Fedora lists mentioned that the PyQt4 module uses a different
API depending on whether it's being run on python-2 or python-3. I've added
a section to the wiki to capture information like that:

http://wiki.python.org/moin/PortingPythonToPy3k#differences-in-specific-libraries

http://wiki.python.org/moin/PortingPythonToPy3k/PyQt4

If you have any other third party module changes that are relevant to
python3 porting feel free to add a page and link it to that section as well.

-Toshio