ReportListeners get informed whenever the state of a report changes.
You should be
aware that most events occur more than once. For example, the reportStarted event will
be triggered every time the report is regenerated.
When handling these events, use
the reportState to track the current changes of the report.
author: Thomas Morgner
Receives notification that report generation has completed, the report footer was
printed, no more output is done. This is a helper event to shut down the output
service.
Parameters: event - The event.