update RRTMG longwave radiation code #1296
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…n code. The main updates
are the addition of the exponential and exponential_random cloud overlap assumptions in the
longwave radiation code, and adding the cloud overlap assumption and decorrelation length as
namelist options in namelist.atmosphere:
-> In Registry.xml, added the options config_radt_cld_overlap and config_radt_cld_dcorrlen.
-> Modified mpas_atmphys_driver_radiation_lw.F to add the two options to the argument list
in the call to subroutine rrtmg_lwrad.
-> Updated module_ra_rrtmg_lw.F.
…removed lines 12052-14072 which are never compiled. The removed subroutines which mainly read the binary file RRTMG_LW_DATA or RRTMG_LW_DATA.DBL were originally moved to the module ./physics/mpas_atmphys_rrtmg_lwinit.F.
…iver_radiation_lw.F. * In ./src/core_atmosphere/physics/physics_wrf/module_ra_rrtmg_lw.F, removed very old comments and never used wrf-related lines.
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This PR updates the RRTMG longwave radiation code. The chief updates are the addition of the exponential and exponential_random cloud overlap assumptions, and adding the cloud overlap assumption and decorrelation length as namelist options in namelist.atmosphere.