Check use_aerosols with lw_aerosol_scattering
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Check `use_aerosols` in addition to `lw_aerosol_scattering`. In principle, this does not change anything because, if `config%use_aerosols` is false then the single-scattering albedo of aerosols is set to 0 so the results of the two branches, `calc_no_scattering_transmittance_lw` + `calc_fluxes_no_scattering_lw`, and `calc_ref_trans_lw` + `adding_ica_lw`, is the same. In practice, the results are not exactly equal. This is surprising for the user, who expects that the setting of `config%do_lw_aerosol_scattering` can be disregarded if `config%use_aerosols` is false. Moreover, if `config%use_aerosols` is false, we want to go to the faster calculation, `calc_no_scattering_transmittance_lw` + `calc_fluxes_no_scattering_lw`.
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use_aerosolsin addition tolw_aerosol_scattering. In principle, this does not change anything because, ifconfig%use_aerosolsis false then the single-scattering albedo of aerosols is set to 0 so the results of the two branches,calc_no_scattering_transmittance_lw+calc_fluxes_no_scattering_lw, andcalc_ref_trans_lw+adding_ica_lw, is the same. In practice, the results are not exactly equal. This is surprising for the user, who expects that the setting ofconfig%do_lw_aerosol_scatteringcan be disregarded ifconfig%use_aerosolsis false. Moreover, ifconfig%use_aerosolsis false, we want to go to the faster calculation,calc_no_scattering_transmittance_lw+calc_fluxes_no_scattering_lw.