[tz] Yukon, NWT, and Nunavut (Canada)

[Paul Eggert]

Thanks for all that careful work. I installed the attached patches, 
which implement the changes you suggested, except that they retain 
2022f's guess that Yukon's 1965-04-22 spring forward was 00:00→02:00 
instead of 02:00→04:00 as the former seems a bit more likely to me 
(admittedly this is just a guess either way).

Also, I looked for other evidence about Pangnirtung and found a Google 
Books snippet suggesting that EST was used in 1959, so these patches 
move America/Pangnirtung's data to 'backzone' since it appears there's 
no difference from America/Iqaluit since 1970. There is a 
backward-compatibility link as usual.
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