Merge branch 'feature/varopti_NEW' into 'master'
Add variational optimisation framework to NekMesh This adds the variational mesh optimisation framework to NekMesh. Its now throughly tested for triangle, quad, tet and prism meshes along with triangle/quad and prism/tet hybrid meshes. Although not perfect we've got a pretty good grasp of how it behaves and why. Future work will be to move this code into a library as a "variational solver" where NekMesh utilises this along with alternative solvers. See merge request !711
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