updates workflow script (for macOS), Makefiles and SIEM mesh routines; adds explicit type conversions

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 35.90551% with 814 lines in your changes are missing coverage. Please review.

Project coverage is 40.38%. Comparing base (f5d709e) to head (f604d7c).
Report is 1 commits behind head on devel.

Files	Patch %	Lines
src/specfem3D/read_mesh_databases.F90	6.96%	307 Missing ⚠️
src/specfem3D/bcast_mesh_databases.f90	52.10%	239 Missing ⚠️
src/meshfem3D/write_AVS_DX_global_chunks_data.f90	0.00%	79 Missing ⚠️
src/auxiliaries/create_movie_GMT_global.f90	0.00%	23 Missing ⚠️
...ocess_sensitivity_kernels/create_cross_section.F90	0.00%	19 Missing ⚠️
src/specfem3D/save_kernels.F90	18.75%	13 Missing ⚠️
src/meshfem3D/model_scattering.f90	0.00%	12 Missing ⚠️
...ss_sensitivity_kernels/laplacian_smoothing_sem.F90	0.00%	12 Missing ⚠️
src/auxiliaries/write_profile.f90	0.00%	11 Missing ⚠️
src/specfem3D/prepare_attenuation.f90	23.07%	10 Missing ⚠️
... and 25 more

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #837      +/-   ##
==========================================
- Coverage   40.67%   40.38%   -0.30%     
==========================================
  Files         264      266       +2     
  Lines       58753    59234     +481     
==========================================
+ Hits        23900    23921      +21     
- Misses      34853    35313     +460     

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