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_sax.py b/Lib/test/test_sax.py
index 32b7609..acb7658 100644
--- a/Lib/test/test_sax.py
+++ b/Lib/test/test_sax.py
@@ -12,7 +12,7 @@
 from xml.sax.expatreader import create_parser
 from xml.sax.xmlreader import InputSource, AttributesImpl, AttributesNSImpl
 from cStringIO import StringIO
-from test_support import verify, verbose, TestFailed, findfile
+from test.test_support import verify, verbose, TestFailed, findfile
 import os
 
 # ===== Utilities