v4.2.3

• Fix: a computer that only exchanges internet traffic is no longer taken for the network's gateway. Traffic alone now supports a gateway only when DHCP, a route or a person already names it, and traffic to another private network is no longer read as a next hop.
• A gateway that DENIS only guessed (named by DHCP replies, never confirmed) now gives a warning a person ticks, and automation does not act on it. A confirmed gateway, or one with firm evidence (a route, a polled routing switch), is still refused with no way around it.
• The refusal and the warning now say which device and which address caused them.