rem: EventItem(const QString& url, int seqno, const QValueList<QDateTime>& alarmtimes) : calendarURL(url), eventSequence(seqno), alarmTimes(alarmtimes) {}
add: EventItem(int seqno, const QValueList<QDateTime>& alarmtimes) : eventSequence(seqno), alarmTimes(alarmtimes) {}
context:       EventItem(const QString& url, int seqno, const QValueList<QDateTime>& alarmtimes)        : calendarURL(url), eventSequence(seqno), alarmTimes(alarmtimes) {}