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Disable JCommander argument splitting for repeated arguments

Repeatable arguments are treated specially during JCommander parsing.
The default behavior is to split values containing a comma into multiple values for that option.

i.e. `--foo a,b,c` becomes (logically) equivalent to `--foo a --foo b --foo c`.
This is problematic for the `--clusterCriterion` option which is repeatable and can contain commas.

This commit overrides the default comma string splitter with one that performs no splitting.

2 of 2 new or added lines in 1 file covered. (100.0%)

11187 of 12206 relevant lines covered (91.65%)

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