Add in order parameter to make it possibly to use no multiple scattering #2098
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Previously my_s would contain both my_inc and my_s_v2_sum, which seems to be an inclusion of all the other possible scattering processes in a sorta mimicking multiple scattering way.
This however is not in accordance with how the analytical calculations are derived, and this change allows a user to recreate the results one would expect from single scattering.