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Ingested tooling from https://github.com/fmidev/smartmet-timezones and updated timezone data README so we have a means to regenerate the file that is documented. Compared to IANA 2016c, the timezone information in 2025c no longer has a distinction between short and long names. For example in 2016c America/Denver used MST for short, Mountain Standard Time for long, but America/Boise used MST for both. With 2025c they both use MST for short and long, which also means that the built-in "Coordinated Universal Time" long form is now displayed as "UTC" like the short form. While this does not fully resolve #67, it does help us maintain the time zone data file better.