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_iter.py b/Lib/test/test_iter.py
index 0085db5..509ec01 100644
--- a/Lib/test/test_iter.py
+++ b/Lib/test/test_iter.py
@@ -1,7 +1,7 @@
 # Test iterators.
 
 import unittest
-from test_support import run_unittest, TESTFN, unlink, have_unicode
+from test.test_support import run_unittest, TESTFN, unlink, have_unicode
 
 # Test result of triple loop (too big to inline)
 TRIPLETS = [(0, 0, 0), (0, 0, 1), (0, 0, 2),