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_sax.py

@@ -12,7 +12,7 @@ from xml.sax.saxutils import XMLGenerator, escape, quoteattr, XMLFilterBase
 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