Select: postprocessor to save models to YAML intermediately

[dilpath]

Useful to save models as they are calibrated, rather than at the end of model selection. This means model selection can be restarted without needing to recalibrate models, if e.g. a wall time limit is reached on a cluster.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.25%. Comparing base (a559537) to head (7aec89b).

Files with missing lines	Patch %	Lines
pypesto/select/postprocessors.py	55.55%	4 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1647      +/-   ##
===========================================
- Coverage    84.28%   84.25%   -0.03%     
===========================================
  Files          163      163              
  Lines        14136    14144       +8     
===========================================
+ Hits         11914    11917       +3     
- Misses        2222     2227       +5     

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