This tends to make things more robust wrt to error checking and unexpected spaces in file names.

Pull request is here: https://bitbucket.org/simfactory/simfactory2/pull-requests/51/avoid-using-system-mkdir-in-favor-of

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2506/avoid-using-system-mkdir-in-favor-of