SUBROUTINE KNREST(IK)
C
C  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
C   "Restore" the current track parameters to the unconstrained values for
C   track IK, i.e. TRKWKN = TR0WKN.
C
C  IK        integer array (read)
C            Track ID in KN list
C  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>