fixes PML boundary flags and adds example for PML layer extensions in in-house mesher

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 2.61324% with 559 lines in your changes missing coverage. Please review.

Project coverage is 48.81%. Comparing base (349e0e8) to head (c19f7c9).
Report is 22 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/meshfem3D/save_mesh_as_cubit.f90	0.00%	541 Missing ⚠️
src/meshfem3D/create_CPML_regions.f90	0.00%	9 Missing ⚠️
src/meshfem3D/create_meshfem_mesh.f90	33.33%	4 Missing ⚠️
src/decompose_mesh/part_decompose_mesh.F90	0.00%	2 Missing ⚠️
src/specfem3D/read_stations.f90	0.00%	2 Missing ⚠️
src/decompose_mesh/write_mesh_databases.F90	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1808      +/-   ##
==========================================
- Coverage   49.48%   48.81%   -0.67%     
==========================================
  Files         272      273       +1     
  Lines       63573    64631    +1058     
==========================================
+ Hits        31459    31552      +93     
- Misses      32114    33079     +965     

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