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Rewrite all-sky plotting to use wcsaxes and reproject

Leo P. Singer requested to merge leo-singer/lalsuite:wcsaxes-reproject into master

This is a modernization rewrite of the all-sky plotting codes in LALInference, using astropy.visualization.wcsaxes for astronomical projections and reproject for rasterizing HEALPix images.

This is a cleaned-up version of the plotting codes that I used to generate sky map figures for the GW170817 papers.

Note: I'm expecting some initial build failures because I am probably using a lot of bleeding-edge features from Astropy, not to mention adding reproject as a new dependency.

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