dhcp: fix DHCP hooks for ddns and firewall
dhcp: don't request option-6rd, not used
service: use "debian" provider for SysV services

Otherwise, systemd thinks they are not enabled.
proftpd: correct package is "proftpd-basic"
proftpd: give more bandwidth
ddns: update more often
dnsmasq: assign some names to some devices
debian: install mentioned packages
debian: install more tools
dnsmasq: fix MAC address for HL-4150CDN
nginx: add access to web interfaces of switches/printers
firewall: allow nginx to access stuff on lan-isolated
nginx: fix reverse proxy for switches/printers
nginx: don't reverse proxy switches/printers

Those are still in stone age with their absolute URL...
firewall: remove unneeded rule for reverse proxy