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WIP: Export CAD info

Julian Marcon requested to merge meshing/nektar:feature/export-cad-info into master

This branch implements the ability for NekMesh to export and re-import CAD information. In practice, it write a new CAD section in XML files which contains the belonging of each vertex to certain surfaces and curves. It is then able to re-read that information, re-load the CAD system and place those vertices onto the appropriate CAD entities. The user is then able to run varopti as they would straight from an .mcf file (only now they do it from an .xml file).

Note that this solves also the inability of NekMesh to convert .xml (Nektar++) meshes into .msh (Gmsh) meshes.

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