geometry. It introduces subtle bugs when reading high-order post-processing views.

IMHO we should have an explicit command to do this, and not modify the mesh without
warning just by reading a file

operations allowing to have only one method in the objects). Warning
restart methods still to be defined for dG3D and msch IPVariables. 

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use same tolerance in mesh extrusion as in geometry ; if this tol is too large, we should introduce another option