Be a bit more consistent about Metlakatla and Resolute abbr and comments.

* northamerica (America/Metlakatla): Use the more-common "PST"
rather than our invented "MeST" for the abbreviation.  Our source
called it "Pacific Time", as did a contemporaneous news report,
and I couldn't find contemporaneous use of "MeST" or of
"Metlakatla Time".  Cite the news report in the commentary,
and quote some Juneau graffiti.
* zone.tab (America/Resolute): Call it Central Time, not Central
Standard Time, since it observes DST now.
(America/Metlakatla): Call it Pacific Standard Time, not
Metlakatla Time.  Mention that it's in Alaska.
* NEWS: Document the above.