try DEAP instead of pygad

[dmark04]

pygad has no capability currently to make unique points (and devs do not agree their definition of uniqueness is stupid).
So maybe it is interesting to investigate if we can just replace pygad by DEAP?

[dmark04]

in the intial version it seems that our adherence to strict indexing of the population might cause some problems as some of the functions in DEAP reorder the population by fitness (or other ordering criteria)