More small stuff

[brownbaerchen]

This PR includes small fixes and a convergence controller that can abort a run when it exceeds a certain runtime. This was useful to me because some faults would trigger weird behaviour leading to tiny step sizes in adaptive time stepping, or when doing work precision plots I could go to very high precision without needing to consider if this would run before the sun swallows us. Maybe it's useful for someone else as well.

There is still the issue that black removes more blank lines in the CI pipeline than locally on my laptop. If anyone finds a solution, please tell me about it!

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (36e06fe) 73.95% compared to head (d43110f) 73.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #375      +/-   ##
==========================================
- Coverage   73.95%   73.93%   -0.02%     
==========================================
  Files         271      271              
  Lines       22456    22481      +25     
==========================================
+ Hits        16607    16622      +15     
- Misses       5849     5859      +10     

Files	Coverage Δ
pySDC/core/ConvergenceController.py	88.88% <100.00%> (+0.46%)	⬆️
...onvergence_controller_classes/check_convergence.py	84.21% <40.00%> (-0.98%)	⬇️
...controller_classes/interpolate_between_restarts.py	92.68% <78.57%> (-7.32%)	⬇️
...mentations/convergence_controller_classes/crash.py	86.36% <86.36%> (ø)

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