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Revert "do not allow pairwise cutoffs <= 0.0. avoids undefined behavior and…

Authored by Axel Kohlmeyer <akohlmey@gmail.com> on Jul 15 2017, 04:41.

Description

Revert "do not allow pairwise cutoffs <= 0.0. avoids undefined behavior and division by zero errors"

This reverts commit a04711b21f06b78270f852bb62beed12eb7e4475.