New class Select3D_SensitivePrimitiveArray can be initialized directly from
presentation data structures Graphic3d_Buffer defining triangulation or point set.
This class also can combine several elements into patches
to reduce BVH initialization time in at the expense of slower detection time.
AIS_PointCloud::ComputeSelection() - selection is now computed on point set using Select3D_SensitivePrimitiveArray by default.
PrsMgr_PresentableObject::Compute() - redundant default argument value has been dropped.
BVH - store BVH_Set size in local variable to simplify debugging.
