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

[Paul Eggert]

Paul Eggert wrote:
> the idea is to experiment with this approach in the new zones (since they
> have no backwards-compatibility concerns) before using it in other zones.

Attached are two proposed patches along these lines. I haven't installed them 
into the experimental github repository, as I want to test some more first and 
get feedback. The second is merely a related commentary cleanup in zone*.tab.
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