adds 3D Berkeley attenuation model (MODEL = SEMUCB_A3d_3dQ)

[danielpeter]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 7.02479% with 225 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.06%. Comparing base (f6956c6) to head (3bc8df1).
⚠️ Report is 3 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/meshfem3D/model_atten3D_berkeley.f90	0.00%	195 Missing ⚠️
src/shared/get_model_parameters.F90	10.00%	9 Missing ⚠️
src/meshfem3D/meshfem3D_models.F90	30.00%	7 Missing ⚠️
src/specfem3D/initialize_simulation.F90	33.33%	6 Missing ⚠️
src/meshfem3D/setup_model.f90	25.00%	3 Missing ⚠️
src/auxiliaries/write_profile.f90	0.00%	2 Missing ⚠️
src/meshfem3D/save_arrays_solver.f90	60.00%	2 Missing ⚠️
src/meshfem3D/model_attenuation.f90	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #864      +/-   ##
==========================================
- Coverage   37.17%   37.06%   -0.11%     
==========================================
  Files         294      295       +1     
  Lines       68401    68629     +228     
==========================================
+ Hits        25426    25436      +10     
- Misses      42975    43193     +218     

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