SacessOptimizer: Use cloudpickle for passing data to workers

[dweindl]

Cloudpickle is able to handle more complex objects than pickle.

See #1465
Closes #1465

If the new process are forked, we could skip the pickling, but at this point, I don't think that's necessary.

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All modified and coverable lines are covered by tests ✅

Project coverage is 83.43%. Comparing base (b88356f) to head (a63f8ce).

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1467      +/-   ##
===========================================
+ Coverage    83.40%   83.43%   +0.03%     
===========================================
  Files          160      160              
  Lines        13502    13505       +3     
===========================================
+ Hits         11261    11268       +7     
+ Misses        2241     2237       -4     

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[PaulJonasJost]

Does it make sense to perhaps test with specifically a model where it previously failed (e.g. Schwen_PONE2014 from #1465)?

[dweindl]

Does it make sense to perhaps test with specifically a model where it previously failed (e.g. Schwen_PONE2014 from #1465)?

Generally, yes. I already have that lying around. But it will be another slow test due to model import, that's why I left it out so far.

[PaulJonasJost]

Does it make sense to perhaps test with specifically a model where it previously failed (e.g. Schwen_PONE2014 from #1465)?

Generally, yes. I already have that lying around. But it will be another slow test due to model import, that's why I left it out so far.

As we always have the problem to balance between "elaborate" test vs time. Would it make sense to have a set of tests that only run in the (I think weekly) master test?