Minor improvements

[VChristiaens]

... in NEGFC-related and contrast_curve functions.

[codecov-commenter]

Codecov Report

Merging #550 (3c08fa7) into master (87d9b10) will decrease coverage by 0.14%.
The diff coverage is 51.81%.

@@            Coverage Diff             @@
##           master     #550      +/-   ##
==========================================
- Coverage   64.43%   64.29%   -0.14%     
==========================================
  Files          56       56              
  Lines       11630    11690      +60     
==========================================
+ Hits         7493     7515      +22     
- Misses       4137     4175      +38     

Impacted Files	Coverage Δ
vip_hci/metrics/contrcurve.py	62.73% <ø> (ø)
vip_hci/psfsub/utils_pca.py	60.97% <0.00%> (ø)
vip_hci/fm/negfc_speckle_noise.py	59.48% <51.28%> (-12.26%)	⬇️
vip_hci/fm/negfc_fmerit.py	78.87% <75.00%> (-0.11%)	⬇️
vip_hci/fm/negfc_mcmc.py	70.05% <0.00%> (-0.16%)	⬇️
vip_hci/preproc/badpixremoval.py	63.51% <0.00%> (-0.14%)	⬇️

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