Add initial MERSI-LL reader #629
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This adds an initial version of the MERSI-LL reader. This instrument is different enough from MERSI-2 that it gets its own reader. Band 1, I think, is supposed to be the DNB band and that leaves bands 2-7 as IR (brightness temperature) readers. However, our "best" DNB composites "hncc_dnb" and "dynamic_dnb" require moon illumination fraction which is not available in the files unlike VIIRS SDR files. There was some experimentation in Satpy to get this information from a third-party library using lon/lat and date/time to determine what the moons illumination should be, but I'm not sure they ever got it to work.