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_popen2.py b/Lib/test/test_popen2.py
index c67dd71..cf3a094 100644
--- a/Lib/test/test_popen2.py
+++ b/Lib/test/test_popen2.py
@@ -5,7 +5,7 @@
 
 import os
 import sys
-from test_support import TestSkipped
+from test.test_support import TestSkipped
 
 # popen2 contains its own testing routine
 # which is especially useful to see if open files