adds version backward compatibility for Berkeley model; adds speedup modifications to Berkeley model meshing

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 17.09677% with 514 lines in your changes missing coverage. Please review.

Project coverage is 35.56%. Comparing base (1f586de) to head (28c87e4).
Report is 22 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/meshfem3D/model_berkeley.f90	0.00%	195 Missing ⚠️
src/shared/spl_A3d.c	0.00%	141 Missing ⚠️
src/meshfem3D/model_crust_berkeley.f90	0.00%	111 Missing ⚠️
src/shared/model_topo_bathy.f90	0.00%	29 Missing ⚠️
src/meshfem3D/model_1dberkeley.f90	0.00%	16 Missing ⚠️
src/shared/get_model_parameters.F90	22.22%	7 Missing ⚠️
src/specfem3D/ucb_heaviside.f90	0.00%	7 Missing ⚠️
src/meshfem3D/compute_element_properties.f90	50.00%	4 Missing ⚠️
src/meshfem3D/meshfem3D_models.F90	0.00%	2 Missing ⚠️
src/meshfem3D/create_mass_matrices.f90	83.33%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #851      +/-   ##
==========================================
- Coverage   35.60%   35.56%   -0.04%     
==========================================
  Files         284      284              
  Lines       67507    67693     +186     
==========================================
+ Hits        24033    24076      +43     
- Misses      43474    43617     +143     

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