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updates for gfs allsky with qoption=2 and cwoption=3#103

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updates for gfs allsky with qoption=2 and cwoption=3#103
RussTreadon-NOAA wants to merge 1 commit into
GEOS-ESM:developfrom
RussTreadon-NOAA:bugfix/gfs_allsky

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This PR includes two sets of changes

  1. bug fix in src/gsibec/gsigfs/m_nc_GFSens.f90 to remove erroneous T to Tv conversion applied to GFS gaussian grid ensemble members.
  2. add radiance_mod.f90. This is used to set n_clouds_fwd and cloud_names_fwd when performing all-sky radiance assimilation. This change touches four files
src/gsibec/gsi/CMakeLists.txt
src/gsibec/gsi/gsimod.F90
src/gsibec/gsi/prewgt.F90
src/gsibec/gsi/radiance_mod.f90 (new file)

Resolves #102

The changes in this PR have been tested inside GDASApp develop at 2315690. GDASApp atmospheric analysis increments were compared with similarly configured GSI analyses. The GDASApp and GSI analysis increments are consistent with each other.

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Updates for GFS gsi hybrid covariance with qoption=2 and cwoption=3

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