desihub/speclite

Add MaskedArray output option to `accumulate`

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Currently accumulate always returns ndarray. When a MaskedArray is used for input (for at least one of the data_in parameters?), would be nice to automatically return a MaskedArray. Additionally, it would be nice to have the option to force output to either a MaskedArray or (plain) ndarray.

All together, something like a output_type parameter that could be set to "auto", "masked", or "array".