Reorder auc only when needed #91
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This PR adds reordering to the AUC computation, but applies it only when necessary (i.e.
tpris not increasing or decreasing). This prevents the situation where thetprelements corresponding to duplicate values in thefprarray get reordered in an unpredictable manner due to unstable sorting, which in turn may lead to underestimation of the performance score (see my comment under this PR).