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_pyclbr.py

@@ -2,7 +2,7 @@
    Test cases for pyclbr.py
    Nick Mathewson
 '''
-from test_support import run_unittest
+from test.test_support import run_unittest
 import unittest, sys
 from types import ClassType, FunctionType, MethodType
 import pyclbr