More fine grained update of dyndns and dnsupdate.
Try to update only one interface if we are asked so.
Decouple filter.inc from functions.inc. There is no need to process filter functions most of the time. Include filter.inc where it is needed
Zap Informational: services_dyndns_configure() is starting.
functions -> functions.inc
Alert when rc.dyndns.update is starting
require_once("functions");
Add script to kick of dyndns update from crontab