ENDIPE ( geom, disc, ndisc, uorv, param, ifail )
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  Enquire discontinuities on a B-curve or B-surface

Receives:
  KI_tag_geometry          *geom           --- free form geometry
  KI_cod_padi              *disc           --- discontinuities to return

Returns:
  KI_int_nitems            *ndisc          --- number of discontinuities found
 <KI_tag_list_int>         *uorv           --- list of discontinuity types
 <KI_tag_list_dbl>         *param          --- list of parameters
  KI_cod_error             *ifail          --- failure code

Specific errors:
  KI_wrong_entity           'geom' is not a B-curve or B-surface

Description:

  This function will return the discontinuities of a B-curve or B-surface.

  If a surface is received, each element in `uorv' will contain either PAPRUP or
  PAPRVP, depending on whether the corresponding parameter in `param' is the
  parameter of a discontinuity in the constant `u' direction or the constant `v'
  direction.

  If a curve is supplied `uorv' will be null.

  The `disc' argument indicates the level of discontinuities that are to be
  returned. At present the function only returns G1 discontinuities.

  The parameters will be returned in increasing parameter order in `param'. For
  surfaces, the parameters in the `u' direction will be returned before the
  parameters in the `v' direction.

  If there are no discontinuities on the geometry then `ndisc' will be zero and
  both `uorv' and `param' will be null.