8.1.4 flagtime(xflag,low,high,flag,mask_count,ii)

flagtime $<$ chanana $<$ BoaChanAna.f90

! NAM: flagtime  (sub)
! DES: set flag if LST>low and <high 
! INP: 
!      low     = lower limit 
!      high    = upper limit
!      xflag   = rank-1 flag array
! OUT:
!      xflag   = rank-1 flag array
!      mask_count = number of flags changed
!
! HIS: FB040603  adapted from flag