Improve hsup variable (add end date)
Improve hsup variable (add end date)

antoinearnoud/openfisca-france,sgmap/openfisca-france,antoinearnoud/openfisca-france,SophieIPP/openfisca-france,benjello/openfisca-france,SophieIPP/openfisca-france,sgmap/openfisca-france,benjello/openfisca-france