DefaultLogger.addError() only logs AuditEvent.severityLevel if it's WARNING.
This makes it hard to find events of severity ERROR in eg mvn checkstyle:check output.
Log severityLevel in all cases. Patch attached (based on 5.3).
(I know that DefaultLogger is an AuditListener & it's possible to add new AuditListeners, but is it possible to replace DefaultLogger? I also know that checkstyle:check allows you to control the severity threshold, though it doesn't seem possible from the command-line.)