moves PML constants to constants.h.in file; adds real world examples Campi_Flegrei/ and Mendocino_Mw7.0/

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 96.77419% with 3 lines in your changes missing coverage. Please review.

Project coverage is 48.82%. Comparing base (6ae34ca) to head (93c48e3).
Report is 7 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/gpu/specfem3D_gpu_cuda_method_stubs.c	0.00%	2 Missing ⚠️
src/specfem3D/prepare_gpu.f90	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1809      +/-   ##
==========================================
+ Coverage   48.81%   48.82%   +0.01%     
==========================================
  Files         273      273              
  Lines       64631    64644      +13     
==========================================
+ Hits        31552    31565      +13     
  Misses      33079    33079              

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