having it there causes the line to wrap.

on Windows.  The test_sequence() ERROR is easily repaired if we're
willing to add an os.unlink() line to mhlib's updateline().  The
test_listfolders FAIL I gave up on -- I don't remember enough about Unix
link esoterica to recall why a link count of 2 is something a well-
written program should be keenly interested in <wink>.

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. :)

allows using the tests with unittest.py as a script.  The tests will
still run when run as a script themselves.

The test assumed that the local pathname convention for "foo" would sort before "foo/bar", which is not true on the mac (where they are "foo" and ":foo:bar", respectively; ":foo" would be fine too, but "foo" is the preferred spelling). Fixed by sorting the output.