Add support for writing Anopheles SNP data to the plink binary file format (shadow PR)

[alimanfoo]

This PR shadows #515 to get GitHub actions running.

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[jonbrenas]

Tristan has included a notebook in his PR to test the PLINK converter functions. The main issue is that it creates a .bed file which raises issues with correct paths (there also seems to be a problem with authentication when he ran it locally but that’s neither here nor there). I think the best solution is to stop tracking the notebook. @alimanfoo, @ahernank, @cclarkson, @leehart, any opinion?

[tristanpwdennis]

Hi guys, I fixed the test notebook and the local tests are now completing successfully
Cheers!

[alimanfoo]

Thanks @tristanpwdennis, unit tests are now passing :)

Looks like the plink_convert notebook also needs to be updated though to use "output_dir" instead of "results_dir".

[tristanpwdennis]

Whoops, sorry, please blame the psychotropic jetlag. Fixed this now, and updated the output path to be the working dir of the notebook (as opposed to a relative path on my local!). Hope this is OK?

[jonbrenas]

LGTM and approved by @alimanfoo here: #515