Small fixes

[PGijsbers]

Mostly fixes already applied in the #dask branch. As that branch looks less likely to be integrated, I figured I would add the new changes with a separate branch.

[github-actions[bot]]

Please include the change for this PR in the changelog (docs/source/releases.rst).

[codecov[bot]]

Codecov Report

Merging #173 (074554f) into master (9596bf0) will increase coverage by 22.96%. The diff coverage is 33.33%.

@@             Coverage Diff             @@
##           master     #173       +/-   ##
===========================================
+ Coverage   68.26%   91.23%   +22.96%     
===========================================
  Files          45       45               
  Lines        2187     2190        +3     
===========================================
+ Hits         1493     1998      +505     
+ Misses        694      192      -502     

Flag	Coverage Δ
unit-tests	91.23% <33.33%> (+22.96%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gama/configuration/regression.py	100.00% <ø> (ø)
gama/gama.py	84.77% <33.33%> (+30.19%)	:arrow_up:
gama/genetic_programming/components/individual.py	92.75% <0.00%> (+2.89%)	:arrow_up:
gama/genetic_programming/mutation.py	95.16% <0.00%> (+3.22%)	:arrow_up:
gama/utilities/generic/timekeeper.py	94.00% <0.00%> (+4.00%)	:arrow_up:
gama/genetic_programming/selection.py	100.00% <0.00%> (+4.34%)	:arrow_up:
gama/utilities/evaluation_library.py	89.68% <0.00%> (+7.14%)	:arrow_up:
gama/GamaRegressor.py	100.00% <0.00%> (+10.00%)	:arrow_up:
gama/genetic_programming/nsga2.py	97.56% <0.00%> (+10.97%)	:arrow_up:
gama/search_methods/base_search.py	83.33% <0.00%> (+12.50%)	:arrow_up:
... and 13 more

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