[tz] Astrakhan region got approval to change its time zone

[Paul Eggert]

Russ Allbery wrote:
> my sense is that it's much less common to use the two-digit
> form in day-to-day use of ISO 8601,

Yes, I have the same sense. This is the main argument for having 4 digits in the 
offset. I also have the sense that 4 digits have been quite a bit more popular 
in this thread (though I'm not sure how we'd handle Liberia before 1972 -- maybe 
give up and leave that one alphabetic...).

> and it's intended to indicate lower precision.

I don't have this sense for 2-digit zones. I would not expect (and have never 
seen) India's time zone being listed as "+06" because someone felt like rounding 
+0530 up.