subroutine kset_track_is_mass_fixed(ktrk, lmass_fixed)
*
* begin_doc
*
*  Sets the fixed mas flag (which says if the track has a fixed mass, thus
*  forcing the energy to follow the momentum appropriately) for a KWFIT track
*
*  Input Parameters:
*  ktrk           integer variable
*                 KWFIT track number
*
*  lmass_fixed    logical variable
*                  TRUE   ==> Track has fixed mass
*                  FALSE  ==> Track does not have fixed mass
*
*  Output Parameters:
*  None
*
*  Other routines:
*
*  Notes:
*
*  Author:   Paul R Avery      Created:  Mon Jul 28 06:12:33 EDT 1997
*
*  Major revisions:
*
*
* end_doc