Feature fix sorting of optimization results in presence of nan values, fixes #484

[jvanhoefer]

Sorting of optimization values failed, when the objective function value is nan. nan is now treated as inf.

[codecov-commenter]

Codecov Report

Merging #691 (9926083) into develop (f37f050) will increase coverage by 2.74%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #691      +/-   ##
===========================================
+ Coverage    87.60%   90.34%   +2.74%     
===========================================
  Files           96       96              
  Lines         6463     6466       +3     
===========================================
+ Hits          5662     5842     +180     
+ Misses         801      624     -177     

Impacted Files	Coverage Δ
pypesto/result.py	89.28% <100.00%> (+0.60%)	⬆️
pypesto/engine/multi_process.py	92.59% <0.00%> (-7.41%)	⬇️
pypesto/objective/amici.py	84.23% <0.00%> (+0.98%)	⬆️
pypesto/objective/function.py	89.62% <0.00%> (+1.88%)	⬆️
pypesto/sample/geweke_test.py	94.36% <0.00%> (+2.81%)	⬆️
pypesto/objective/amici_calculator.py	93.33% <0.00%> (+5.00%)	⬆️
pypesto/objective/amici_util.py	84.21% <0.00%> (+10.52%)	⬆️
pypesto/optimize/optimizer.py	90.09% <0.00%> (+32.94%)	⬆️
pypesto/engine/mpi_pool.py	68.18% <0.00%> (+68.18%)	⬆️

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