kbls.bls_stats_singleperiod: add kwarg
kbls.bls_stats_singleperiod: add kwarg

sometimes maxtransitduration is still good to specify

waqasbhatti/astrobase,waqasbhatti/astrobase,lgbouma/astrobase,waqasbhatti/astrobase,lgbouma/astrobase,lgbouma/astrobase