Version bump, release notes, Belarusian and Slovak locales, and the rest of the midnight-drag work (#253). Also the fixes from reviewing this branch: EXDATE zone prefixes in the form the provider actually writes, "only this event" on a row that does not recur, RDATE carried through the recurrence rewrite, an exact test for the reminder default sentinel, the widget's re-arm backstop, and the counts a stopped import reports.