Added copy constructor for creating a deep copy of a calendar
Added copy constructor for creating a deep copy of a calendar

amannm/ical4j,ariordan/ical4j,voronaam/ical4j,ical4j/ical4j,amannm/ical4j,amannm/ical4j,tschaible/ical4j,ical4j/ical4j,ical4j/ical4j,tschaible/ical4j,ariordan/ical4j,voronaam/ical4j,ariordan/ical4j,voronaam/ical4j,tschaible/ical4j