[tz] zone.tab deprecation

[Matt Johnson]

I understand the differences between zone.tab and zone1970.tab, but why does zone.tab have to be deprecated?  Can't we just maintain both files indefinitely?  Then developers can choose whichever file makes sense for their scenario.

Is there a specific reason for the deprecation?

If it is to be dropped at some point - how far out is that, and does it get maintained until then?