Make setup.py support Py3
Make setup.py support Py3

lsaffre/lino-welfare,khchine5/lino-welfare,lsaffre/lino-welfare,lino-framework/welfare,lsaffre/lino-welfare,lino-framework/welfare,lsaffre/lino-welfare,lino-framework/welfare,khchine5/lino-welfare,lsaffre/lino-welfare,khchine5/lino-welfare,lino-framework/welfare,khchine5/lino-welfare,khchine5/lino-welfare,lino-framework/welfare