OUCPCU ( curve, surf, uorv, param, sense, ifail )
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  Outputs a constant parameter line curve.

Receives:
  KI_tag_curve             *curve          --- Tag of constant parameter curve

Returns:
  KI_tag_surface           *surf           --- Underlying surface
  KI_cod_papr              *uorv           --- Constant u or constant v
  KI_dbl                   *param          --- Parameter value
  KI_cod_logical           *sense          --- Curve sense
  KI_cod_error             *ifail          --- failure indicator

Specific errors:
  KI_bad_type               Invalid curve.

Description:
  This function, given the tag of a constant parameter line curve, returns the
  information which defines the curve.

  'curve'  is the existing curve from which the information is to be obtained.

  'surf'   is the tag of the underlying surface on which the curve lies.

  'uorv'   indicates whether the curve is :
           Constant u ( i.e. in the v direction )  ( uorv = PAPRUP )
           Constant v ( i.e. in the u direction )  ( uorv = PAPRVP )

  'param'  gives the constant parameter value.

  'sense'  is the sense of the constant parameter curve.