Kenzo-2-2 => Kenzo-2-3

  The speial-smsts.cl is modified ; the bsgn slot had been forgotten
  in the sphere-wedge constructor.

Kenzo-2-1 => Kenzo-2-2

  The delta.cl file is modified, but the modification is not
  satisfactory : the slot face *should_be* able to generate the slot
  dffr.