Add downward freezing level search#1546
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A new routine FRZLVLHI.f is adapted from the existing routine FRZLVL.f to introduce a downward search for the local freezing level from the GFS output. The downward search has the effect of finding the highest level with a freezing temperature value more precisely than is performed by FRZLVL2.f, but excludes freezing levels in tropospheric inversion layers.
This PR includes a call to FRZLVLHI in place of FRZLVL within the routine MISCLN for testing purposes, whereas a new call to FRZLVLHI should be included in MISCLN in addition to existing calls to FRZLVL and FRZLVL2. As with #1539, unique GRIB fields will be needed in parameter files to store data obtained from FRZLVLHI separately from FRZLVL and FRZLVL2.
Additional commentary of UPP tests using FRZLVLHI.f are provided in #1005.