runner: reinstate all unittest arguments; add --output #174
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I tested with Python 2.7, 3.5 and 3.7, and at least --buffer works
everywhere. I was also missing a way to specify the output directory,
so I added the ability to do so.
This fixes #143 and closes #144.
(Please note that the change doesn't affect Python 2.7 as it uses a different approach to parsing arguments.)