Ligo.skymap

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- When running ``ligo-skymap-stats`` without injections, instead of writing
``nan`` values for irrelevant columns, don't write the columns in the first
place.

- Start process of switching to tqdm for progress bars so that long-running
operations show time estimates.

- In ``ligo-skymap-stats``, disable OpenMP parallelism if running with ``-j``
to avoid creating a huge number of threads on machines with very many
cores.

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- Fix ``--condor-submit`` option for ``bayestar-localize-coincs``.

- Add ``--duty-cycle`` option to ``bayestar-realize-coincs``.

- Rename ``ligo-skymap-aggregate-found-injections`` to ``ligo-skymap-stats``
and ``ligo-skymap-plot-found-injections`` to ``ligo-skymap-plot-stats``. The
new ``ligo-skymap-stats`` program can generate summary statistics for
skymaps, with or without injection-finding.

- This is the first version that has been tested and shown to reproduce the
results in the "First Two Years" paper, which is the review benchmark.

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- Bring back simulation tools from LALSuite.

- Add ``ligo-skymap-plot-airmass``, a tool for probabilistic airmass charts.

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- Adjust CI configuration for uploading to PyPI.

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- Initial release.