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this should be trivial enough, so I'll push it to the shared repo directly.

it currently fails.

of sending a notify.  adjusting the main code and tests to this behavior,
while keeping externally observable behavior as much as possible.

The method was in the LoggerImp class but omitted from
Logger.  This was a small fix so incorporated in this ticket.

Allow default logging severity for unit tests to be specified
and overridden by an environment variable.

installed as readable files).

These files weren't changed when root_logger_name.h was renamed to
logger_name.h.  Rather than just change the #include file name, the
logging was correctly initialized.

Create BIND 10 root logger as child of the (unused) log4cplus
root logger and create other loggers as children of that.  This
simplifies the inclusion of logger name in output messages.
Also, enhance documentation.