Deprecate reference_input_variable in France
Deprecate reference_input_variable in France

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