bug#34315: [PATCH] icalendar.el: DURATION fix + more robust timezone handling

[Lars Ingebrigtsen]

thunk2@arcor.de (Thomas Plass) writes:

> It fixes general issues with icalendar.el's handling of timezones as
> commonly used in ical data and the standard tzurl.org repo.  It is
> also completely backwards-compatible as far as I can make out.
>
> Here's the README for the testcases I provided to Ulf along with the patch:

Can you respin the patch and add the test cases to
test/lisp/calendar/icalendar-tests.el?  The icalendar test files should
go to a new test/data/icalendar directory, I guess.

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