[plt-scheme] Suggestion for (lib "date.ss"): add timezone to 'american

I'm sort of obsessed with time zones: I think every date or time that
is displayed to a human, or read from a human, should include a time
zone.  The string returned by "date->string" only contains a time zone
if the parameter "date-display-format" is rfc2822, but I'd like at
least the default format to include it as well.  So this patch adds
the time zone to the 'american format; adding it to others would be
easy.
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