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_pkg.py b/Lib/test/test_pkg.py
index c9e771d..224cefa 100644
--- a/Lib/test/test_pkg.py
+++ b/Lib/test/test_pkg.py
@@ -3,7 +3,7 @@
 import sys, os, tempfile, traceback
 from os import mkdir, rmdir, extsep          # Can't test if these fail
 del mkdir, rmdir
-from test_support import verify, verbose, TestFailed
+from test.test_support import verify, verbose, TestFailed
 
 # Helpers to create and destroy hierarchies.