add back nonlinearity

config/obs_config_SCI_WIDE_phot.yaml

@@ -63,7 +63,7 @@ call_sequence:
     dead_pixels: YES
     bad_columns: YES
   # Apply response nonlinearity
-  # nonlinearity: {}
+  nonlinearity: {}
   # Apply CCD Saturation & Blooming
   blooming: {}
   # Run CTE simulation