code cleaning and test updates

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 5.17241% with 55 lines in your changes missing coverage. Please review.

Project coverage is 53.22%. Comparing base (875b5d0) to head (e524e89).

Files	Patch %	Lines
src/specfem2D/prepare_attenuation.f90	4.76%	20 Missing ⚠️
src/shared/read_material_table.f90	0.00%	9 Missing ⚠️
src/specfem2D/compute_stacey_electromagnetic.f90	0.00%	9 Missing ⚠️
src/specfem2D/invert_mass_matrix.F90	0.00%	5 Missing ⚠️
src/specfem2D/setup_mesh.F90	0.00%	5 Missing ⚠️
.../specfem2D/compute_attenuation_electromagnetic.f90	0.00%	3 Missing ⚠️
src/specfem2D/compute_forces_electromagnetic.F90	0.00%	2 Missing ⚠️
src/specfem2D/read_materials.f90	50.00%	1 Missing ⚠️
src/specfem2D/setup_sources_receivers.F90	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #1231   +/-   ##
=======================================
  Coverage   53.21%   53.22%           
=======================================
  Files         171      171           
  Lines       31402    31403    +1     
=======================================
+ Hits        16712    16713    +1     
  Misses      14690    14690           

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