Define a IANA registry for Catalog Zone Properties

[wtoorop]

A proposal to deal with issue #58

[mind04]

This registry will only work for catalog version "2"

[wtoorop]

This registry will only work for catalog version "2"

Good point. This can be added in a "Note:"

[wtoorop]

[wtoorop]

This registry will only work for catalog version "2"

Good point. This can be added in a "Note:"

Added with commit 839fcad