Update proper support for SEG-Y Rev 2+

[BrianMichell]

Resolves #866

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.10%. Comparing base (c3ba558) to head (206f96c).
⚠️ Report is 255 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #876      +/-   ##
==========================================
+ Coverage   85.30%   93.10%   +7.79%     
==========================================
  Files          46      148     +102     
  Lines        2219     8426    +6207     
  Branches      306      470     +164     
==========================================
+ Hits         1893     7845    +5952     
- Misses        281      508     +227     
- Partials       45       73      +28     

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