[Vxl-maintainers] vbl_shared_pointer change

[Amitha P. <ami...@us...>]

Folks,

I changed vbl_shared_pointer so that derived->base conversions are
supported, like that of raw pointers. The cost is the removal of the
convenience constructors
  vbl_shared_ptr<X> p( 1 )
instead of
  vbl_shared_ptr<X> p( new X(1) )

Let me know if anyone disagrees with this.

Amitha.