add tests +small bug fix in validation intervals fixes #674, #675

[jvanhoefer]

• More detailed tests: Test e.g. if the "perfect" prediction gives p=1.0 and if the significance decreases with increasing mismatch between prediction and measurement.

• Bug fix: There was a sign error in the validation interval computation, that led to wrong results...

[codecov-commenter]

Codecov Report

Merging #676 (1c08614) into develop (160c2a8) will increase coverage by 2.16%.
The diff coverage is 89.07%.

@@             Coverage Diff             @@
##           develop     #676      +/-   ##
===========================================
+ Coverage    88.16%   90.33%   +2.16%     
===========================================
  Files           79       96      +17     
  Lines         5257     6363    +1106     
===========================================
+ Hits          4635     5748    +1113     
+ Misses         622      615       -7     

Impacted Files	Coverage Δ
pypesto/ensemble/covariance_analysis.py	18.36% <0.00%> (-0.39%)	⬇️
pypesto/optimize/__init__.py	100.00% <ø> (ø)
pypesto/ensemble/utils.py	57.57% <22.22%> (-5.59%)	⬇️
pypesto/predict/task.py	43.75% <43.75%> (ø)
pypesto/petab/__init__.py	63.63% <50.00%> (ø)
pypesto/objective/amici.py	83.67% <51.85%> (-6.16%)	⬇️
pypesto/problem.py	91.57% <58.33%> (+0.34%)	⬆️
pypesto/objective/amici_util.py	84.21% <66.66%> (+8.31%)	⬆️
pypesto/engine/mpi_pool.py	68.18% <68.18%> (ø)
pypesto/visualize/misc.py	82.41% <72.22%> (-2.52%)	⬇️
... and 81 more

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