Add --help, --quiet options to test.py.

Add --help, --quiet options to test.py.

Fixes Ben's "unintuitive test.py interface" bug:

Date: Wed, 27 Jan 2010 14:09:14 +1100
From: Ben Finney
Subject: [Be-devel] Re: Test suite on Trevor's development branch
...
> $ python ./test.py -q
>
> ----------------------------------------------------------------------
> Ran 0 tests in 0.000s
>
> OK

Running a Python unittest-capable test suite with "-q" should run it in
"quiet" mode, where progress is indicated by single characters along a
lone, and only failures and errors are reported.
...