Fix wrong answer to simple name query when --domain-needed set, but no
upstream servers configured. Dnsmasq returned REFUSED, in this case,
when it should be the same as when upstream servers are configured -
NOERROR. Thanks to Allain Legacy for spotting the problem.

Return REFUSED when running out of forwarding table slots, not SERVFAIL.

Add --max-port configuration. Thanks to Hans Dedecker for the patch.

Add --script-arp and two new functions for the dhcp-script.  These are
"arp" and "arp-old" which announce the arrival and removal of entries
in the ARP or nieghbour tables.

Extend --add-mac to allow a new encoding of the MAC address as base64,
by configurting --add-mac=base64

Add --add-cpe-id option.