[tz] Reason for removal of several TZ

[Paul Eggert]

Guy Harris wrote:
> (Just out of curiosity, how was that point chosen?

Originally I took zone*.tab latitudes and longitudes from Shanks, who I presume 
got it from some circa-1960 gazetteer (he does not list his sources). These 
coordinates are all to one arc-minute accuracy. Some of the more-recently edited 
coordinates have come from Wikipedia or suchlike sources. I haven't viewed the 
latitudes and longitudes as being important enough to support via cited sources, 
since they're intended only as a rough guide for a UI.