splitMeshRegions: automatic repatching

Functionality to add/problem to solve

cht cases can be tricky to mesh and set-up for large numbers of regions. One improvement would be to add support inside splitMeshRegions to automatically detect which regions/faces are close together and auto-generate patches for these.

Target audience

cht without correct patching

Proposal

Using the AMI algorithm see what produces a valid match and pick up these faces.

What does success look like, and how can we measure that?

On a reasonable mesh see whether the patching is done correctly.