Get rid of relative imports in all unittests.  Now anything that
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. :)
diff --git a/Lib/test/test_hmac.py b/Lib/test/test_hmac.py
index b7b3c07..f9cd73e 100644
--- a/Lib/test/test_hmac.py
+++ b/Lib/test/test_hmac.py
@@ -1,6 +1,6 @@
 import hmac
 import unittest
-import test_support
+from test import test_support
 
 class TestVectorsTestCase(unittest.TestCase):
     def test_vectors(self):