[GMSH2OGS] Enable to read physical ids of a mesh created by Gmsh 4
In GMSH2OGS
, only the Gmsh ASCII file created by Gmsh version 2.2 is accepted. This MR enables to read physical ids of a mesh created by Gmsh 4 and exported as Version 2 ASCII
format file. Since there no Gmsh version information in the Version 2 ASCII
format file, a command line flag is introduced to indicate whether the mesh is created by using Gmsh version 2. By this MR, the default Gmsh version must not be less than 4 for OGS tools.
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