use object name as default scheduler name (when "SchedulerName" property not explicitly specified); do not accept a pre-registered Scheduler instance in the Quartz SchedulerRepository anymore; do not expose the Spring-created/managed Scheduler to the Quartz SchedulerRepository anymore; added "ExposeSchedulerInRepository" flag for explicit exposure to the SchedulerRepository; introduced SchedulerAccessorObject for registering jobs/triggers/listeners on an existing Quartz Scheduler instance
