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_mhlib.py b/Lib/test/test_mhlib.py
index ef5877d..862d301 100644
--- a/Lib/test/test_mhlib.py
+++ b/Lib/test/test_mhlib.py
@@ -7,7 +7,7 @@
 ###      mhlib.  It should.
 
 import unittest
-from test_support import run_unittest, TESTFN, TestSkipped
+from test.test_support import run_unittest, TESTFN, TestSkipped
 import os, StringIO
 import sys
 import mhlib