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_openpty.py b/Lib/test/test_openpty.py
index fb81719..858c9ea 100644
--- a/Lib/test/test_openpty.py
+++ b/Lib/test/test_openpty.py
@@ -1,7 +1,7 @@
 # Test to see if openpty works. (But don't worry if it isn't available.)
 
 import os
-from test_support import verbose, TestFailed, TestSkipped
+from test.test_support import verbose, TestFailed, TestSkipped
 
 try:
     if verbose: