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Add Gmsh 4.0 standard

Julian Marcon requested to merge meshing/nektar:feature/gmsh-4.0 into master

This adds the Gmsh 4.0 mesh file format standard to the input module in NekMesh. This is in accordance with their user guide gmsh.pdf and has been tested on one of the tutorial files (sphere.msh generated from sphere.geo). I have also run ctest and it looks like all Gmsh 2.2 and under meshes are still being read fine.

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