[tz] Irish Standard Time vs Irish Summer Time

[Clive D.W. Feather]

Paul Eggert said:
> It's probably better to consistently use the phrase "daylight saving 
> time", as this is common usage (at least in the US) and it maps well to 
> the tm_isdst variable of C. Logically DST can be observed in summer just 
> as easily as in winter, and there's no logical requirement that it must 
> advance the clock: after all, one can "save" daylight at the start of 
> the day, and this is just as easy as "saving" it at the end.

However, please make it clear that no daylight is actually saved.

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Clive D.W. Feather          | If you lie to the compiler,
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