Fuzzy overlap Jaccard and Dice indices computation

Calculates various overlap measures between probabilistic distribution maps of segmentations, using the fuzzy definition proposed in: Crum et al., Generalized Overlap Measures for Evaluation and Validation in Medical Image Analysis, IEEE Trans. Med. Ima. 25(11),pp 1451-1461, Nov. 2006.

Follows the standard Overlap interface. For justification of this method, please see provided ref.