array_processing

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This PR adds a helper function similar to getrij() which converts tape-and-compass survey data — i.e., arrays of distances and azimuths to each array element — to rij format. This allows users to provide alternative array measurements for e.g. small aperture arrays where an averaged GPS point is not precise enough. See companion PR https://github.com/uafgeotools/lts_array/pull/34 which allows lts_array to directly use rij arrays.