Remove PE_MEMBER logic that is no longer relevant

[rsdunlapiv]

The PE_MEMBER logic in NEMS and the model_configure is no longer relevant and should be removed. This remains historically from a prior version of NEMS that supported ensembles in the same MPI world.

See here:

NEMS/src/module_NEMS_GRID_COMP.F90

Line 279 in b593c6c

CALL ESMF_ConfigGetAttribute(config = CF_NEMS &

and here:

NEMS/src/module_NEMS_GRID_COMP.F90

Line 308 in b593c6c

,petlist = PETLIST(1:PE_MEMBER) & !<-- Element I's PE list

In all cases now, the NEMS EARTH DRIVER runs across all PETs and so specification of the petList parameter to ESMF_GridCompCreate() is not required.

The recommended approach is to remove all PE_MEMBER logic from NEMS.

This also allows for removal of PE_MEMBER01: inside model_configure. Its presence there is confusing anyway since that file is a config file for the atmosphere, and not the overall NEMS level.

[rsdunlapiv]

@DusanJovic-NOAA @junwang-noaa @mark-a-potts @theurich

[DusanJovic-NOAA]

In one of the future commits we will remove module_NEMS_GRID_COMP.F90 entirely. It does nothing except instantiate Earth Grid Comp, which can be done directly in the main program.
This is the version of the main program that calls Earth Grid Comp directly.
MAIN_NEMS.F90.txt
It still reads PE_MEMBER01 which I just moved from NEMS Grid comp. It should be removed.

[DusanJovic-NOAA]

See this branch:
https://github.com/DusanJovic-NOAA/NEMS/tree/remove_nems_grid_comp/src

[rsdunlapiv]

@DusanJovic-NOAA I like the simplicity of this. NEMS is getting very small. This is basically just the unified driver now. @theurich @mark-a-potts