Fix SBX prob_bin parameter behavior #673
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The prob_bin parameter for SBX behaves incorrectly, where one child is preferentially distributed about the higher values of the parents and the other the lower values. This PR fixes the behavior so prob_bin controls similarity to the parents instead.
Examples for prob_bin=0.25 with 3 variables in [-2, 2]
Parent 1 is [-1, 1, -1]
Parent 2 is [1, -1, 1]
Before the fix:
After the fix:
