Update fit_gev and related functions

[stellema]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 38 lines in your changes are missing coverage. Please review.

Comparison is base (71a8ebd) 38.31% compared to head (7059303) 39.12%.

Files	Patch %	Lines
unseen/stability.py	0.00%	16 Missing ⚠️
unseen/eva.py	45.45%	12 Missing ⚠️
unseen/independence.py	0.00%	9 Missing ⚠️
unseen/moments.py	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
+ Coverage   38.31%   39.12%   +0.81%     
==========================================
  Files          20       20              
  Lines        1814     1858      +44     
==========================================
+ Hits          695      727      +32     
- Misses       1119     1131      +12     

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