updates postscript plotting; updates submodules and readme

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 52 lines in your changes missing coverage. Please review.

Project coverage is 53.20%. Comparing base (0f7caa5) to head (3ceb1a5).
Report is 5 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/specfem2D/setup_mesh.F90	3.44%	28 Missing ⚠️
src/specfem2D/plot_post.F90	25.00%	18 Missing ⚠️
src/specfem2D/write_postscript_snapshot.f90	54.54%	5 Missing ⚠️
src/meshfem2D/repartition_coupling.f90	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1246      +/-   ##
==========================================
- Coverage   53.25%   53.20%   -0.05%     
==========================================
  Files         171      171              
  Lines       31452    31483      +31     
==========================================
+ Hits        16749    16751       +2     
- Misses      14703    14732      +29     

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