Implement the latest CRTM REL-2.2.3 in WRFDA

[jamiebresch]

TYPE: enhancement

KEYWORDS: WRFDA, CRTM, REL-2.2.3

SOURCE: internal

DESCRIPTION OF CHANGES:

1. Add pristine CRTM REL-2.2.3.
   After untarring the source file
   ftp://ftp.emc.ncep.noaa.gov/jcsda/CRTM/REL-2.2.3/crtm_v2.2.3.tar.gz,
   (1) rename the directory from REL-2.2.3 to crtm_2.2.3,
   (2) remove the fix directory,
   (3) remove the libsrc/test directory.
   (4) remove unused files for non-WRFDA build mechanism
   The CRTM changes are described in var/external/crtm_2.2.3/crtm_release_notes.txt

2. Make WRFDA compile with crtm_2.2.3 and
   have crtm_2.2.3 use the same compilation flags as in configure.wrf
   (the reason is to avoid maintaining another set of compiling options
   in var/external/crtm_2.2.3/config-setup where only a subset of WRFDA supported
   compilers are included by default).
   (1) Change crtm_2.1.3 to crtm_2.2.3 in top-level Makefile and compile.
   (2) Change crtm_2.1.3 to crtm_2.2.3 in var/Makefile to have ./clean -a work.
   (3) Add makefile in var/external/crtm_2.2.3 and var/external/crtm_2.2.3/libsrc
   (4) Apply previous in-house crtm-2.1.3 fixes for older compilers.
   M var/external/crtm_2.2.3/libsrc/CRTM_Surface_Define.f90
   M var/external/crtm_2.2.3/libsrc/NLTECoeff_Define.f90

3. Add "RECORDLENGTH = -assume byterecl" in arch/configure_new.defaults for ifort stanzas.
   It has no impact. The flag is only used for compiling CRTM.
   CRTM requires the flag -assume byterecl for Intel compilers
   because of the direct access read of a long integer in
   Binary_File_Utility.f90.

4. This is the first stage of the CRTM update.
   (1) After more tests, the older crtm_2.1.3 libs and coefficient files will be removed.
   (2) Overcast radiance is available with a different output name than what was implemented
   in-house previously for cloud detection applications. The related code is enclosed in
   #ifdef CRTM_MODIF and needs to be updated/cleaned up later.

LIST OF MODIFIED FILES:
M Makefile
M arch/configure_new.defaults
M compile
M var/Makefile
A var/external/crtm_2.2.3 (a bunch of files in the dir)
A var/run/crtm_coeffs_2.2.3 (a bunch of files in the dir)

TESTS CONDUCTED:

1. Mike tested that the code compiled with the following compilers.
   GNU 4.8.2, 5.3.0, 6.1.0
   Intel 12.1.5, 15.0.3. 16.0.2
   PGI 13.3
2. WRFDA regtest radiance cases show different results as expected.
3. Larger differences are seen with Intel compilers because of the -fp-model flag.
   crtm_2.1.3 has no -fp-model flag. crtm_2.2.3 uses -fp-model source by default.
   WRFDA uses -fp-model precise.
   -fp-model source and -fp-model precise give identical results.

[mkavulich]

Approved by dev committee