imports of test_support.  That causes multiple copies of test_support
to get loaded, and the one used by test_base64.py didn't see the proper
value of verbose=False, so spewed output.  That in turn apparenly caused
Barry to check in an expected-results output file, but a unitttest-based
test should never have one of those.  I noticed this because, on Windows,
the final unittest output line contains the number of seconds needed to
run the test, and that varied on *some* runs when I tried it, causing
bogus test failures.

Anyway, this gets rid of the expected-output file again, and changes
the imports to work with 2.2's way of doing this.