ADPAPE ( pg, t, uorv, ifail )
=============================

  Add parameter (line) to a B-curve or B-surface

Receives:
  KI_tag_geometry          *pg             --- B-curve or B-surface
  KI_dbl_parameter         *t              --- split parameter
 <KI_cod_papr>             *uorv           --- parameter in which to split

Returns:
  KI_cod_error             *ifail          --- failure indicator

Specific errors:
  KI_bad_knots              new knot would cause invalid knot multiplicity
  KI_bad_parameter          parameter out of range
  KI_bad_parametric_prop    unsuitable property
  KI_wrong_entity           'pg' is not a B-curve or B-surface
  KI_is_attached            geometric entity is attached to topology

Description:
  This function modifies a B-curve or B-surface by inserting a knot, resulting in
  the addition of a (possibly null) segment, or row or column of patches.
  The shape of the B-curve or B-surface is not changed.

  The parameter 'uorv' is not used if the entity is a B-curve.
  If the entity is a B-surface then 'uorv' must take one of the
  following values:

  . PAPRUP - add a parameter line in the u direction (i.e. a constant v
             parameter line).
  . PAPRVP - add a parameter line in the v direction (i.e. a constant u
             parameter line).

  The parameter t at which the new knot is to be inserted must be within the
  range as given by ENCUPA (curves) or ENSUPA (surfaces) repectively.

  The new knot must not increase the multiplicity of any existing knot to more
  than the order for an end knot, or order-1 for an internal knot.
  If 't' lies within a segment or patch then a new segemt, row of patches
  ('uorv' = PAPRUP) or column of patches ('uorv' = PAPRVP) will be added to
  the curve or surface.

  If 't' lies on a segment or patch boundary then the segment, row or column of
  patches added will be null. Adding a null segment to a curve or surface only
  affects the B-spline representation (it duplicates a knot).


  A B-curve or B-surface cannot be modified if it is attached to an edge
  or face.