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_dl.py b/Lib/test/test_dl.py
index 390dbd8..d1f73b2 100755
--- a/Lib/test/test_dl.py
+++ b/Lib/test/test_dl.py
@@ -4,7 +4,7 @@
 """
 
 import dl
-from test_support import verbose,TestSkipped
+from test.test_support import verbose,TestSkipped
 
 sharedlibs = [
     ('/usr/lib/libc.so', 'getpid'),