read_sixte_lc: Change time=time_hi to time=time_lo, test for TIMEPIXR
SIXTE and the ISISScripts use the convention TIMEPIXR=0, i.e. the time field in the lightcurve equals the beginning of the time bin (time_lo)
SIXTE and the ISISScripts use the convention TIMEPIXR=0, i.e. the time field in the lightcurve equals the beginning of the time bin (time_lo)