for future reference: how to build an sdist

I just updated DEVNOTES with the following item:

Make sure sdist builds setuptools-compatible release: Remove setup.cfg
(or, if more than the [egg_info] section is in this file, remove the
[egg_info] section). See
http://mail.python.org/pipermail/distutils-sig/2006-July/006561.html for
more info.