#10 debug mode causes internal errors to be logged

[Danny Faught]

When I set the DEBUG environment variable and run
stress_driver, the debug messages from the Event module
come across as warnings, which are now logged as
internal errors. These messages should not be counted
as internal errors.

[Danny Faught]

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Event module debugging is now set only if DEBUG is greater
than 1. This needs to be documented. We can now hopefully
set DEBUG to 1 without getting spurious warnings.