Add a "confirm export" button in web interface.

[msimerson]

Idea proposed by Arthur G:
"In the NicTool Client's Name Server configuration screen just add a "Check NS is serving latest data" button (that's a big button), which calls a Perl class that runs your SQL query and performs a DNS lookup of the serial using some Perl API. If up-to-date, display a green tick, otherwise display a red cross with the two zones with their serials. Also cater for a timed-out result for people that leave old name servers inside the Nictool configuration or misconfigure their networks."