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_richcmp.py b/Lib/test/test_richcmp.py
index 4e7d459..f4c2c7f 100644
--- a/Lib/test/test_richcmp.py
+++ b/Lib/test/test_richcmp.py
@@ -1,6 +1,6 @@
 # Tests for rich comparisons
 
-from test_support import TestFailed, verify, verbose
+from test.test_support import TestFailed, verify, verbose
 
 class Number: