Pytest-arraydiff

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- Fix broken ``single_reference=True`` usage. [43]

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- Add ability to compare to Pandas DataFrames and store them as HDF5 files [23]

- Fix ``array_compare`` so that the ``atol`` parameter is correctly used with
FITS files. [33]

- Test inside ``pytest_runtest_call`` hook. [36]

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- Removed `astropy` as required dependency. [31]

- Formally register `array_compare` as marker.

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- Minimum Python version is now 3.7. [30]

- Various infrastructure updates.

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- Fixed compatibility with pytest 4+. [15]

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- Fix compatibility with recent versions of Astropy and Numpy. [8, 10]

- Add back support for returning HDUs from tests. [5]