Pegs

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* Fix continuous integration testing workflow in Github
Actions to work with Python 3.6.
* Pin required version of ``xlsxwriter`` to 3.1.9, and
fix associated bug when creating XLSX files with TADS
using this version.
* Fix documentation generation on ReadTheDocs.
* Add ``CITATION.cff`` file to GitHub repository (adds
citation information to the repository front page).

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* Always use the ``Agg`` ``matplotlib`` backend (to
avoid problems with systems where ``DISPLAY``
environment variable is set but no graphical
display is available.
* Update documentation for ``mk_pegs_intervals`` to
clarify how to obtain suitable input files.

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* Update the citation information following publication
of supporting paper on F1000Research
(https://f1000research.com/articles/10-570/v2)

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* Patches to improve handling of input files: fix
problems with sorting filenames, and perform explicit
checks on peaks and cluster files to ensure that they
exist and are not actually directories.
* Update the Conda installation instructions in the
``README`` and documentation.

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* Update the ``README`` and "getting started"
documentation to include installation from Conda.

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* Patches to update the ``README`` and glucocorticoid
examples to reflect the new command line format
introduced in version 0.6.0.

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