Applicability domain

Classes for checking applicability domain.

---

BoundingBoxADChecker	Bounding box method.
ConvexHullADChecker	Convex hull method.
DistanceToCentroidADChecker	Distance to centroid method.
HotellingT2TestADChecker	Hotelling's T^2 test method.
LeverageADChecker	Leverage method.
PCABoundingBoxADChecker	PCA bounding box method.