LSSTDESC/rail_astro_tools

add a module to merge close-by objects in catalog into blends

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I'm interested in adding a degrader in rail that takes in a catalog of truth objects, identify possible unrecognized blends and merge those objects into one blended source. Some thoughts are needed for assigning the flux, size and shape for merged objects.

implemented adding fluxes of closeby objects into a blend
merged branch from rail_astro_tools/issue/9/bl_degrader #44

todo: add the shapes of a blend