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.

src/NCollection/NCollection_BaseVector.hxx

@@ -184,6 +184,9 @@ protected: //! @name protected methods
     myData = allocMemBlocks (myCapacity);
   }
 
+  //! Destructor
+  virtual ~NCollection_BaseVector() {}
+
   //! @return pointer to memory where to put the new item
   Standard_EXPORT void* expandV (const Standard_Integer theIndex);