Added Zope's test.py, and a unit test to sxp. This test itself isn't very

exciting, but it's there to encourage the creation of more interesting ones.  A
test target has been added to the main Makefile, and the one in tools/python.

Signed-off-by: Ewan Mellor <ewan@xensource.com>

tools/python/README

@@ -0,0 +1,3 @@
+The file test.py here is from the Zope project, and is Copyright (c) 2001,
+2002 Zope Corporation and Contributors.  This file is released under the Zope
+Public License, version 2.0, a copy of which is in the file ZPL-2.0.