Django-perf-rec

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* Fix to actually obey the ``HIDE_COLUMNS`` option.

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* Add the ``HIDE_COLUMNS`` option in settings to disable replacing column lists
with ``...`` in all places.

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* Don't replace columns in ORDER BY, GROUP BY and HAVING clauses.

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* Use ``kwargs-only`` library rather than vendored copy.
* Erase volatile part of PostgreSQL cursor name.

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* Exposed the automatic naming logic used in ``record()`` in two new functions
``get_perf_path()`` and ``get_record_name()``, in order to ease creation of
test records from calls outside of tests.
* Made the automatic test detection work when running under a Pytest fixture.
* Stopped throwing warnings on Python 3.
* Fixed loading empty performance record files.

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* Make cascaded delete queries deterministic on Django <1.10, with another
Patchy patch to make it match the order from 1.10+.