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_sha.py b/Lib/test/test_sha.py
index cad7780..c438cc6 100644
--- a/Lib/test/test_sha.py
+++ b/Lib/test/test_sha.py
@@ -5,8 +5,8 @@
 # http://www.itl.nist.gov/div897/pubs/fip180-1.htm
 
 import sha
-import test_support
 import unittest
+from test import test_support
 
 
 class SHATestCase(unittest.TestCase):