[tz] Yukon time history updates with references containing some Canadian and global data

[Paul Eggert]

Thanks for all that work!  I'm not sure I knew that Yukon formerly had 
two time zones.  Luckily that predates 1970, and as far as I can tell 
the legal history you found is all consistent with what's currently in 
the tz database for America/Dawson.  I installed the attached patch into 
the experimental version.  This consists of most of your email, slightly 
reformatted to fit into comments, and with a few elisions where it 
seemed we could omit stuff without losing time info.
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