Updated and user defined GHG concentrations for RRTMG #1071
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This PR updates the initial GHG concentrations in RRTMG SW+LW to more recent values. In addition, the user can specifiy the values by setting co2_content, n2o_content, and ch4_content to the desired values in the physics section of namelist.atmosphere.
New default values are 410 ppmv for CO2, 330 ppbv for N2O, and 1850 ppbv for CH4.