Ligo.skymap

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- Prebuilt binary wheels for macOS are now relocatable. See
`delocate38 <https://github.com/matthew-brett/delocate/pull/38>`_.

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- Make lalsuite and lscsoft-glue required dependencies.

- The Python code is now required to pass linting by
`Flake8 <http://flake8.pycqa.org/en/latest/>`_.

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- On reading, rename columns from Fermi GBM HEALPix files to match the
LIGO/Virgo convention. In particular, rename any column named `PROBABILITY`
to `PROB`.

- Reduce the memory footprint of ``ligo-skymap-plot-airmass`` by transposing
two nested loops.

- Make some cosmetic improvements to ``ligo-skymap-plot-airmass``:

* Add altitude and local time axes.
* Center plot on local solar midnight.
* Adjust blending and z-order of twilight shading.

- ``ligo-skymap-plot-airmass`` will now write an airmass table to stdout.

- Rewrite the MCMC mode of BAYESTAR using ``ligo.skymap.ez_emcee``, a new
reusable, fire-and-forget, parallel-tempering, MCMC sampler that features
automated convergence testing and progress monitoring.

- Update common files from Astropy package template.

==================

- Add ``ligo-skymap-combine``, a tool to combine sky localizations from
different observations into a joint skymap.

==================

- Move ``ligo.skymap.eigenframe.EigenFrame`` to
``ligo.skymap.coordinates.EigenFrame``.

- Add a new Astropy coordinate frame ``ligo.skymap.coordinates.DetectorFrame``
to visualize triangulation rings with pairs of detectors.

- Deprecate all functions in ``ligo.skymap.postprocess.detector_frame``.

- Overhaul documentation so that all essential functionality is presented on
the front page.

- Move ``ligo.skymap.command`` to top-level ``ligo.skymap.tool`` module.

- Require version 0.3.2 of the ``reproject`` package because of a regression
that was caused by improper handling of nans in the ``astropy-healpix``
package. See <https://github.com/astropy/astropy-healpix/pull/77>.

==================

- Declare the top-level ``ligo`` module as a namespace package.

- Update common files from Astropy package template.

- Enable Python version check in ``setup.py`` and top-level namespace package.