checkMesh aspect ratio

Functionality to add/problem to solve

checkMesh calculates an aspect ratio in the global coordinate system. More relevant would probably using a cell-local coordinate system.

Proposal

Use the cell-local coordinate system calculation from e.g. the cellDeterminant check and determine the aspect ratio in that.

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

Make e.g. cavity with a lot of grading. See if the reported aspect ratio changes if the case is rotated (e.g. using transformPoints -rotate)