working on #1706 : log full traceback also for IOError
working on #1706 : log full traceback also for IOError

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