imports e.g. test_support must do so using an absolute package name
such as "import test.test_support" or "from test import test_support".
This also updates the README in Lib/test, and gets rid of the
duplicate data dirctory in Lib/test/data (replaced by
Lib/email/test/data).
Now Tim and Jack can have at it. :)
the urljoin() function, which exercises the urlparse() and urlunparse()
functions as side effects.
(Moshe, why did we have perfectly empty tests checked in for this?)