Incorporate Detection and Identification Rate and Curve

Merged André Anjos requested to merge DIR-3991aee9 into master

Created by: siebenkopf

After some discussion: https://groups.google.com/forum/?fromgroups#!topic/bob-devel/TL6ODJ_WPTA we have come up with a solution for measures for open set recognition, which I have implemented. Time to merge...

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