Turn on GSD cloud ceiling calculation for RRFS dev.

* Updates to UPP for RRFS applications:
1) Adding a RRFS-specific .xml control file and a corresponding .txt flat file.  Note that script changes (pending) are needed to leverage the new flat file.  However, this code will work in current real-time configurations.
2) Adding GSL experimental ceiling diagnostics, GSL visibility diagnostic, and GSL sea-level pressure reduction (MAPS).  Also adding TKE and aerosol number concentrations.
3) Code clean-up for ceiling-related diagnostics; added comments, etc.
4) Removing several non-needed variables, originally inherited from FV3-SAR community configuration.

…a_fsl_boulder" and the generating process as "hrrr". The "hrrr" specification is temporary, and will eventually be switched to "rrfs" once required changes to the "NCEPLIBS-g2tmpl" library are available. (NOAA-GSL#4)

…-GSL#5)

* Adding README file to describe process of making a "flat" file.

* Updates to README to improve explanation of input/output files.

…erval (ARI) precipitation datasets for comparison with model QPF within UPP.

…es in SURFCE.f

Exceedance code to output comparisons of QPF with Flash Flood Guidance

…ring the test results with the merged version.(NOAA-GSL#9)

Update code based on testing with RRFS cases.

Fixed several bugs in the code.

Merge remote-tracking branch 'upstream/RRFS_GSL_post_merge' into HEAD

… lat-lon grid interpolation for FFG

Adding check for existence of FFG file to avoid crash when missing, and handling of interpolation to rotated lat-lon grid.

…e consistent with updated FV3LAM model with higher model top. (NOAA-GSL#13)

…dance variables; one for 1h FFG and one for run total FFG exceedances.

…n total acc)

… RUC LSM.

…them on later.

…this subroutine!

Code changes in preparation for pushing to NOAA-EMC/UPP (including 9 soil level update)

…sl_updates

…-10C REFD being all zeroes.

…ote that EMC's unified post_avblflds.xml does not validate using the avblflds Schema.

…lflds.xml file.

…to suggestion from Wen Meng.

 into noaa_gsl_updates

… are now included in post_avblflds.xml

…lng"

…This also affects postxconfig-NT-3drtma.txt. postxconfig-NT-fv3lam_rrfs.txt also changed due to changes in post_avblflds.xml

…it is needed.