Review follow-ups on the import work:
- All-day reminder offsets are `days * 1440 - timeOfDay`, so rounding to the
nearest day lost a day for any producer whose all-day notifications fire after
noon ("1 day before at 18:00" arrives as -PT6H). Round up instead.
- Export decodes an all-day row's raw provider offset back to its whole-day lead
time. It is normally negative, and the writer discards a trigger that fires
after the event, so our own backups came back with no all-day reminder at all.
- A floating EXDATE DATE-TIME is read in the series' zone, not the device's;
otherwise the exclusion lands on an instant no occurrence has.
- Wire the parsed calendar name up: it had no reader, so the CATEGORIES handling
was inert. It now preselects a target calendar of that name.
Jean-Luc Makiola
db4611d284