Tighten checks in legal_hostname().
replace inet_addr with inet_pton() in src/option.c
Only use ourselves as default DNS server for RA if we're doing DNS.

This makes RA the same as DHCP4/6
 Handle IPv4 interface-address labels in Linux.
Fix failure to start with ENOTSOCK
Generalise --interface-name to cope with IPv6 addresses.
Debian changelog update.
Fix hang from new interface-name code, when using TCP.
Update Debian resolvconf script for dnscrypt-proxy integration.
Fix option parsing for --dhcp-host.
Remove limit in prefix length in --auth-zone.
Log forwarding table overflows.
Allow constructed ranges from interface address at end of range.

Also make man page on this clearer, as it's been confusing many.
Add constructor-noauth: keyword
Don't BIND DHCP socket if more interfaces may come along later.