Add the pssac GMT module.

[joa-quim]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 49.12281% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.94%. Comparing base (afc1625) to head (85a506a).

Files with missing lines	Patch %	Lines
src/seis/pssac.jl	45.28%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1886      +/-   ##
==========================================
+ Coverage   85.66%   85.94%   +0.28%     
==========================================
  Files         178      179       +1     
  Lines       26745    26830      +85     
==========================================
+ Hits        22910    23060     +150     
+ Misses       3835     3770      -65     

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