updates gravity (for CPU-only simulations); adds CUDA-aware MPI

[danielpeter]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 35.65217% with 370 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.73%. Comparing base (21e40fd) to head (f19a5ee).
⚠️ Report is 2 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/specfem3D/read_mesh_databases.F90	11.70%	83 Missing ⚠️
src/specfem3D/compute_element.F90	70.81%	61 Missing ⚠️
src/specfem3D/prepare_gravity.f90	0.00%	53 Missing ⚠️
src/check_mesh_quality/check_mesh_quality.f90	0.00%	37 Missing ⚠️
src/shared/write_VTK_data.f90	0.00%	30 Missing ⚠️
src/specfem3D/lts_assemble_MPI_vector.F90	7.69%	24 Missing ⚠️
src/specfem3D/initialize_simulation.F90	26.08%	17 Missing ⚠️
src/shared/assemble_MPI_scalar.f90	40.90%	13 Missing ⚠️
src/gpu/specfem3D_gpu_cuda_method_stubs.c	0.00%	12 Missing ⚠️
...3D/compute_forces_viscoelastic_calling_routine.F90	16.66%	10 Missing ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1870      +/-   ##
==========================================
- Coverage   40.79%   40.73%   -0.07%     
==========================================
  Files         276      277       +1     
  Lines       65953    66250     +297     
  Branches    10577    10609      +32     
==========================================
+ Hits        26906    26986      +80     
- Misses      39033    39250     +217     
  Partials       14       14              

Flag	Coverage Δ
coverage-testname-	40.73% <35.65%> (-0.07%)	⬇️

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