Katropton: Add supports for Gmsh 4

As observed by @R.Boman, katropton was not working with MPI using Gmsh 4. This was due to the fact that Gmsh 4 does not save the ghost cells by default.

To save those cells, we have to use the option -part_ghosts as discussed in the Gmsh doc.

However, this option is not supported by Gmsh 3 (gmsh -h | grep "ghost" does not find any line). Therefore, to solve this issue, the code must test the version of Gmsh used and, if the major version is 4 or greater, must add the -part_ghosts argument.

This MR includes the correction of if statements in plat*.geo which prevented the use of newer Gmsh than 3.0.6.

Ca, ça marche pas?

tmp = subprocess.check_output(["gmsh", "--version"])

au lieu de passer par un fichier

C’est ce que j’ai essayé de faire dans un premier temps. J’ai essayé sur mac et sur Ubuntu mais ça ne marchait ni sur l’un ni sur l’autre. L’output s’affiche à l’écran mais n’est pas passé à l’output de la fonction.

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• 9eaeec57 - Katropton: use checkout_output instead of a temporary file to get gmsh version

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• 1b9f93fe - Katropton: resolve a string bug with python3 in the get_gmsh_version function

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