Duplicate Geo Zones

This modification adds the ability to duplicate Geo Zones, copying existing geo zone data into a new entry with a single click.

When managing Geo Zones, it's common to have to create zones that are very similar or even exact duplicates of existing ones: You might want to set up separate sets of geo zones for tax and shipping, or for different shipping alternatives. In this case, this may help you save some time.

vQmod based, doesn't overwrite core files or create new ones.

Tested on 1.5.3.x and above, but will probably work on any version that supports Geo Zones - feel free to report back with any feedback!