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_errno.py

@@ -4,7 +4,7 @@
 """
 
 import errno
-from test_support import verbose
+from test.test_support import verbose
 
 errors = ['E2BIG', 'EACCES', 'EADDRINUSE', 'EADDRNOTAVAIL', 'EADV',
           'EAFNOSUPPORT', 'EAGAIN', 'EALREADY', 'EBADE', 'EBADF',