Varobs cx xios fix

[Jonas Ganderton (mo-jonasganderton)]

Summary

Enables the Varobs Writer and CX Writer filters to work when XIOS is used in server mode.
Done by switching from using mpl_comm_world to mpi_group in the relevant filters.

Testing

mo-bundle tests

I've tested malak kgo_glu_jopa_jada using XIOS in server mode, this results in KGO changes for JOPA and JADA. This is not the default behaviour, but demonstrates this works should we want to change.
This was done using a couple of custom branches - these are not designed for merging, primarily because I've taken the 4dvar iodef for testing purposes.

• Uses custom jjdocs branch - feature/test_xios
  • New configuration.nml for C48-C192 with XIOS
  • jopa_process adapted to use XIOS server mode
  • XIOS replacing monio in yamls
  • Extra fields to field def
• Uses custom malak changes to make use of the jjdocs changes

Resolves

• Use a supplied communicator group and not MPI_COMM_WORLD #237

[Chris Thomas (ctgh)]

Thanks for the fix!

[Chris Thomas (ctgh)]

Jonas Ganderton (@mo-jonasganderton) can you try retriggering the CI please?

[Jonas Ganderton (mo-jonasganderton)]

Chris Thomas (@ctgh) Just tried a few times, including with debug mode. It always seems to skip the gnu-openmpi check?