adds additional topo and STF feature for Berkeley model SEMUCB

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0.29484% with 2029 lines in your changes missing coverage. Please review.

Project coverage is 35.60%. Comparing base (9607835) to head (f2569f1).

Files with missing lines	Patch %	Lines
src/specfem3D/ucb_heaviside.f90	0.00%	1942 Missing ⚠️
src/shared/model_topo_bathy.f90	4.65%	82 Missing ⚠️
src/specfem3D/locate_sources.f90	25.00%	3 Missing ⚠️
src/meshfem3D/compute_element_properties.f90	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #850      +/-   ##
==========================================
- Coverage   36.70%   35.60%   -1.10%     
==========================================
  Files         283      284       +1     
  Lines       65481    67507    +2026     
==========================================
+ Hits        24032    24033       +1     
- Misses      41449    43474    +2025     

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