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. :)

Lib/test/test_pickle.py

@@ -1,8 +1,8 @@
 import pickle
-import test_support
 import unittest
 from cStringIO import StringIO
 from pickletester import AbstractPickleTests, AbstractPickleModuleTests
+from test import test_support
 
 class PickleTests(AbstractPickleTests, AbstractPickleModuleTests):