image_filename now starts with decam/ mosaic/ or 90prime/, added multiple skyrms columns to compare sigmaclipped median sky with that of splinesky
image_filename now starts with decam/ mosaic/ or 90prime/, added multiple skyrms columns to compare sigmaclipped median sky with that of splinesky

legacysurvey/legacypipe,legacysurvey/legacypipe