fix the discretization process of CMA-ESwM #191
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I have modified the discretization process and the margin correction of CMA-ESwM.
There was a problem where the continuous value before discretization was not encoded into the correct discrete variable when it matched a discretization threshold. This problem occurred when the probability distribution extremely converged, but in some cases, a discrete variable outside the domain could be generated.
The code has been modified so that the processing when the continuous value before discretization matches the discretization threshold follows the definition in the CMA-ESwM paper [Hamano+, GECCO2022]. In other cases, the behavior of the algorithm after the changes is consistent with its behavior before the changes.