[tz] Swiss time selectable for Germany

[Paul Eggert]

On 2023-01-07 01:53, Benjamin Drung via tz wrote:
> Thanks. Could you add " (Germany)" to Büsingen? It is too small to be
> commonly known in Germany.

I looked into how that string is used, came up with what I hope is a 
better idea, tested it, and fixed another glitch or two that I found.

The idea is that zone1970.tab's comment column should cover only 
countries that have multiple timezones, so that it needn't worry about 
summarizing all the other countries (which don't need the summary anyway).

I installed the attached patches to implement this. With it, if you run 
tzselect and choose Germany, you see:

   Please select one of the following timezones.
   1) Büsingen enclave
   2) Germany (most areas)

which I hope is good enough in the context where you've already picked 
Germany. It's OK when someone who runs tzselect doesn't know about 
Büsingen, as they should just shrug and pick the "most areas" line.

Patch 1 implements this change.

Patch 2 shortens the TF comment so that if you run tzselect and pick 
Asia, the prompt still fits on a 24×80 screen (it ballooned in 2022b).

Patch 3 improves tzselect so that it takes advantage of the Patch 1 
change. This change improves behavior both with older and bleeding-edge 
tzdata. Older tzselects will still work, though their 
(already-confusing) messages will be perhaps a bit more confusing in 
some cases. I hope this tzselect improvement migrates into Ubuntu soon.

Patch 4 fixes a glitch related to Johnston Island that I found while 
testing.
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