Super-csv

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* Let the ``DeferrableMixin.save()`` method take an optional ``operating_user`` parameter.

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* Commit after ``CSVOperation`` creation so that async celery tasks can find the operation record when they start.

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* If a class inheriting from DeferrableMixin has a field user_id, use that user for the CSVOperation

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* Reverses the ordering of CSV operation history rows

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* Changes checksum column to avoid CSV quoting issues

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* Exposes additional fields in serialized history of operations re:degree of success of the operation