[tz] Irish Standard Time vs Irish Summer Time

[Paul Eggert]

Paul Eggert wrote:
> the EU didn't standardize daylight-saving transition 
> rules until 1977.

I should have written "the European Communities", since the EU didn't exist in 
1977. I see that our commentary is a bit confused about this issue. I attempted 
to fix the problems I found by installing the attached changes to the commentary.
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