CRKNPA ( bods, eds1, eds2, neds, negs, nnegs, over, nover, ifail )
==================================================================

  Creates a knitting pattern from a list of bodies

Receives:
  KI_tag_list_body         *bods           --- list of bodies

Returns:
 <KI_tag_list_edge>        *eds1           --- list of edges forming pattern
 <KI_tag_list_edge>        *eds2           --- list of edges forming pattern
 <KI_int_nitems>           *neds           --- number of edge pairs in pattern
 <KI_tag_list_body>        *negs           --- list of bodies to be negated
 <KI_int_nitems>           *nnegs          --- number of bodies in 'negs'
 <KI_tag_list_body>        *over           --- list of bodies with no edges
                                           --- in the pattern
 <KI_int_nitems>           *nover          --- number of bodies in 'over'
  KI_cod_error             *ifail          --- failure code

Specific errors:
  KI_cant_create_pattern    failure to create knitting pattern
  KI_pattern_invalid        knitting would result in invalid body
  KI_bodies_dont_knit       no coincident edges exist
  KI_bad_type               body in list is of incorrect type
  KI_duplicate_list_item    duplicate item in list
  KI_general_body           general body

Description:
  This function creates two lists of edges which form the knitting pattern
  used as input to KNITEN. Corresponding elements in the lists are
  coincident edges that will be fused in the resultant knitted body.

  The received body list 'bods' may contain either solid or sheet
  bodies, not wires. In the case of solids, all edges which the
  application intends to appear in the knitting pattern must have one
  adjacent face with a surface attached and one without.  The faces in
  the solid without surfaces attached will be those which are eventually
  redundant when the resultant solid body is created using the pattern
  output by CRKNPA by calling KNITEN.

  'eds1' and 'eds2' are the edge lists that form the knitting pattern and
  'neds' is the length of each of these lists.

  'negs' is a list of the bodies in the received list 'bods' that should be
  negated before calling KNITEN. This is done by calling NEGENT. If these
  bodies are not negated the knitting operation will result in inconsistent
  face normals within shells of the knitted body.

  'nnegs' is the number of bodies in 'negs'.

  'over' contains a list of leftover bodies, ie bodies which have no edges
  in the returned knitting pattern.
  'nover' is the number of bodies in 'over'.

  Negating some of the received bodies may not be sufficient to produce a
  valid knitted body. For example, knitting could result in a moebius strip.
  Such cases will be identified and will result in ifail KI_pattern_invalid.

  If none of the edges in the received bodies are coincident, ifail
  KI_bodies_dont_knit will be returned. If however a subset of bodies in the
  received list has coincident edges, a knitting pattern will be created and
  an ifail will not be invoked. The bodies with no edges in the pattern will
  be returned in 'over'.

  Note that this routine may not preserve the topology of the received bodies:
  edges may be split in order to produce a 1:1 correspondence between the
  edges that form the pattern.

  This function is not supported for general bodies.