Tutorial idea: create a table with coordinates, time data, show how to write and read

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The idea would be to target astronomers who make and distribute catalogs of objects. There are some nice features in astropy.io and astropy.table for round-tripping Astropy objects to binary and ascii files, e.g., http://docs.astropy.org/en/stable/io/unified.html#writing-and-reading-astropy-time-columns.

I just today learned about using astropy_native=True in Table.read(), so I'd like to show this off!