Allow applications partitioning meshes to specify partition constraints (imposed by multigrid)

[mo-rickywong]

PR Summary

Sci/Tech Reviewer:
Code Reviewer:

ticket:4630 relocated checks/code-path for constraints on partitions when using MultiGrid within the the partitioners. This is a check that the partitioner (or infrastructure) should not be performing (it's a Gungho Science feature).

The contraints on multigrid are being triggered if the mesh file from which a mesh was read, contained intergrid maps, regardless of whether the application had any interest in multigrid (e.g. Lfric2Lfric re-gridding). This change provides logic for applications to specify whether they are concerned with "Multigrid" constraints.

Ideally, the checks should be relocated to Gungho Science. This change achieves the desired outcome without compounding ticket:4630 complexity.

Code Quality Checklist

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Testing

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trac.log

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Sci/Tech Review

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(Please alert the code reviewer via a tag when you have approved the SR)

Code Review

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