Feature/mpi halo resize

[twsearle]

Description

Changes to update tests for compatibility with the new atlas-orca mesh generator halo = 1.

Issue(s) addressed

Part of ecmwf/atlas-orca#19

Dependencies

• jjdocs change for testing in sith https://github.com/MetOffice/jjdocs/pull/167
• atlas-orca change to introduce halo > 0 mesh generation Refactor to allow halo > 0 decomposition of the mesh ecmwf/atlas-orca#20

Impact

Enable domain distributed MPI for improved performance of high resolution models.

Testing

• spice_ostia configuration on spice
• spice_ocnd configuration on spice
• spice_ocnd_nosubsample configuration on spice
• spice_ocnd_eorca12 configuration on spice
• spice_ocnd_eorca12_nosubsample configuration on spice
• spice_gl_ocn configuration on spice
• spice_gl_ocn_nosubsample configuration on spice
• xc_ostia configuration on xc
• xc_ocnd configuration on xc
• xc_ocnd_nosubsample configuration on xc
• xc_ocnd_eorca12 configuration on xc
• xc_ocnd_eorca12_nosubsample configuration on xc
• xc_gl_ocn configuration on xc
• xc_gl_ocn_nosubsample configuration on xc
• I have updated the unit tests to cover the change
• New functions are documented briefly via Doxygen comments in the code
• I have linted my code using cpplint
• I have run the unit tests
• I have run mo-bundle to check integration with the rest of JEDI and run the unit tests under all environments

[s-good]

Looks great, thanks. Just one small syntax error to fix.