[tz] tz dependency lat & lng

[Lester Caine]

Guy Harris wrote:
> And if there are any tzdb zones that correspond to*historical*  boundaries not represented in the current OSM, you're going to get boundaries from the 4D version of the OSM:
> 	http://wiki.openstreetmap.org/wiki/Historical

http://www.openhistoricalmap.org/ is rather empty at the moment, but yes changes 
to boundary locations are already being archived in the change log, and adding 
historic areas will be catered for in the OHM.

-- 
Lester Caine - G8HFL
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