Zero Temperature Jacobian for model top level (to limit sensitivity of radiances to model top biases).

Simplify & clean existing code.

Handle fractional sea-ice information coming from Polar-WRF model.

Since the "Gamma" bias correction and AIRS MMR Cloud Detection need a modified version of CRTM, the corresponding code has been put under the compilation test "#ifdef CRTM_MODIF".

Modified routines
var/da/da_radiance/da_transform_xtoy_crtm.inc
var/da/da_radiance/da_transform_xtoy_crtm_adj.inc
var/da/da_radiance/da_get_innov_vector_crtm.inc
...

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