algo/: Remove delta_max, use delta_min only in FineSegmenter.
delta_max is now useless. It was use to make sure we didn't segment something not robust enough. Now we use the e-value, which is a much trustable value. delta_min is useless to the KmerSegmenter (we can't have overlaps with the first_max, last_max algorithms). But it can still be useful to FineSegmenter, that's why we keep it.
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