Debugs of the script for mesh format conversion Gmsh -> Specfem2d

[mnagaso]

This is an important update for EXAMPLES/Gmsh_example_CPML_MPI.

The python script for converting the mesh file format from Gmsh to Specfem2D had some bugs on:

• writing node ids.
• dupilcated elements' edges definitions between acoustic-elastic boundary (thus no energy transition at the interface).

Additionally, a new function has been added for inserting a transition layer between PML layers and a non-PML domain, which may useful to stabilize the simulation.

All the debugs are on the scripts in this example, thus no effect on the main code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.63%. Comparing base (32c7839) to head (9739716).

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1211      +/-   ##
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- Coverage   54.64%   54.63%   -0.01%     
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  Files         164      164              
  Lines       30233    30233              
==========================================
- Hits        16520    16519       -1     
- Misses      13713    13714       +1     

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