WCOSS2 port

[MichaelLueken]

The GFS v16.3 package will be the first implementation on WCOSS2. In order to facilitate the running of real time parallels, which will be required shortly, the current changes in feature/gfsda.v16.1.5_wcoss2_port will be merged into the develop branch, along with the rest of the GFS v16.3 updates.

This work will be done in the feature/wcoss2_port branch.

For more details, please see issues #246 and #298.

[MichaelLueken]

In d3caccb:

1. Update cmake_minimum_required in CMakeLists.txt files from 2.6 and 2.8 to 3.16.1.
2. Add cmake_policy options in CMakeLists.txt files for CMake 3.20+ versions.
3. Add WCOSS2 entries to cmake/Modules and cmake/Modules/platforms.
4. Bring in gfsda.v16.1.6 fix file updates.
5. Necessary updates to jobs/ and scripts/ to run on WCOSS2.
6. Added WCOSS2 lua modulefile and replaced Hera and Orion tcl modulefiles with lua modulefiles.
7. src/gsi/ensctl2state.f90 and src/gsi/ensctl2state_ad.f90 had pointers nullified to correct runtime failures.
8. src/gsi/read_obs.F90 added silent=.true. to call to unformatted_open.
9. Updates to MinMon, OznMon, and RadMon packages for WCOSS2.

The regression tests were run on WCOSS-D and all passed successfully (expected, since none of the changes affect results). The code failed to compile in debug mode. Intel 18 doesn't have the noexternal keyword for the -warn option (externals was introduced with Intel 19). Removed the noexternal keyword from the -warn option in cmake/Modules/setIntelFlags.cmake. All DA components successfully built and the debug tests successfully ran through to completion.

It should be noted that the removal of the noexternal keyword will require that the work in feature/acorn_debug_cleanup to be completed and merged into the develop branch in the authoritative repository (declaring all externals in source code).

Additional testing on Hera required before creating PR.

[MichaelLueken]

In 7728739:

1. Added wrf_io entries in Hera and Orion lua modulefiles.
2. Added #SBATCH --mem=0" to ush/sub_hera to allow all regression tests to run on Hera.
3. Changed cmake_minimum_required from 2.6 to 3.16.1 for ConMon package.

The DA components were successfully built on Hera and a regression test was submitted. The regression test successfully ran and passed.

Now, to ensure that the code continues to compile successfully on WCOSS2.

[MichaelLueken]

In 1526872:

1. Added wrf_io module in WCOSS2 lua modulefile.
2. Changed cmake_minimum_required from 2.6 to 3.16.1 in util/*/CMakeLists.txt

The code successfully built on Cactus. A stand alone script was submitted using the executable built from feature/wcoss2_port and successfully ran through to completion.

Now creating PR to bring WCOSS2 port changes in to the authoritative repository's develop branch.