0025571: Avoid base Classes without virtual Destructors

0025571: Avoid base Classes without virtual Destructors

Destructors of collection classes from NCollection and math_Function are made virtual to allow safe destruction by pointer to base class.

Destructors of classes HatchGen_IntersectionPoint, IntCurveSurface_Intersection, Intf_Interference, IntRes2d_Intersection are made protected to avoid possibility of destructing by pointer to corresponding base class.