httpd: Missed in the 306 merge, should resolve issue with backing up settings (issue #456)
rc: Rewored the way LEDs were handled by the Stealth Mode-related code to resolves issues of LEDs being turned on when they shouldn't (such as from issue #457)
rc: Fix const correctness.
dhcpv6: Request a /56 IA_PD prefix
dhcpv6: Make sla-len config optional
dhcpv6: Make sla-id config optional
dhcpv6: Don't set sla-len
dhcpv6: pass IA_PD prefix to dhcpv6 state script
rc: Use ipv6 address assigned to lan interface to calculate prefix

This way radvd will advertise the correct prefix subnet for the
lan interface.
rc: Set ipv6 prefix from value passed by dhcp6c
httpd: Correct LAN IPv6 address displayed in system log