class.boical.inc.php
285: handle exceptions field on export (delimiter changed to ";")
295: handle TRANSP value (0 or 1) on export
554: handle exceptions field on import
568: handle TRANSP value (0 or 1) on import
774-777: set supported fields for recur_exceptions and non_blocking
added support for handling non blocking events for vcal(1.0) and ical(2.0)