Save results fits

[Eixalde]

Saving the results (frame, detmap and parameters) is now possible, using multi-extension fits files. It is also possible to load them from the same files

[codecov-commenter]

Codecov Report

Merging #607 (7a3d8d6) into master (6cbea8d) will decrease coverage by 0.17%.
The diff coverage is 38.67%.

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@@            Coverage Diff             @@
##           master     #607      +/-   ##
==========================================
- Coverage   57.77%   57.60%   -0.17%     
==========================================
  Files          66       66              
  Lines       13273    13362      +89     
==========================================
+ Hits         7668     7697      +29     
- Misses       5605     5665      +60     

Impacted Files	Coverage Δ
vip_hci/psfsub/pca_fullfr.py	51.44% <ø> (-0.10%)	⬇️
vip_hci/objects/postproc.py	63.33% <25.93%> (-13.21%)	⬇️
vip_hci/var/object_utils.py	61.29% <28.57%> (-9.54%)	⬇️
vip_hci/preproc/parangles.py	23.88% <33.33%> (ø)
vip_hci/fits/fits.py	44.59% <50.00%> (-1.83%)	⬇️
vip_hci/objects/ppandromeda.py	93.62% <100.00%> (+0.14%)	⬆️
vip_hci/objects/ppfmmf.py	90.62% <100.00%> (+0.30%)	⬆️
vip_hci/objects/ppframediff.py	93.55% <100.00%> (+0.22%)	⬆️
vip_hci/objects/ppllsg.py	92.50% <100.00%> (+0.19%)	⬆️
vip_hci/objects/pploci.py	90.91% <100.00%> (+0.28%)	⬆️
... and 4 more

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