subroutine ktrk_move_arc(ktrk, distance, error)
*
* begin_doc
*
*  Move a track and its covariance matrix by the specified distance. The
*  current B field is used to transport the track.
*
*  Note: The current and unconstrainted track parameters are both moved
*  the same distance.
*
*  Input Parameters:
*  ktrk           integer variable
*                 Track number
*
*  distance       double precision variable
*                 Distance to move track
*
*
*  Output Parameters:
*  error          integer variable
*                  = 0  if all OK
*                  > 0  if error
*
*  Other routines:
*
*  Notes:
*
*  Author:   Paul Avery      Created:  Tue Sep  9 22:58:55 EDT 1997
*
*  Major revisions:
*
*
* end_doc