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Compare QDateTime times, timespecs, and timezones

Glen Ditchfield requested to merge gditchfield/kcalendarcore:identical-datetimes into master

Add a function to compare two QDateTimes to see if their timeSpecs and time zones are equal, in addition to the moment in time that they represent. Use it to decide whether incidences have been dirtied, or are equal.

I declared the new identical() function in incidencebase.h because I plan to call it in the incidence editor, and didn't see a better choice of include file.

I call it in Period::operator==(), Recurrence::Private::operator==(), and RecurrenceRule::Private::operator==() because as I read the RFC those datetimes can have time zones or be floating.

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