Comment (by Samuel Cupp):

Sorry if I was unclear before, but we aren’t trying to get the MHD into this release anymore. Just GRHayLib, GRHayLHD(X), and GRHayLID(X). I have documentation.tex that I have been working on, but I haven’t finished and pushed it yet. I will update as soon as I do.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2745/inclusion-of-grhayl-library-and-associated