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Basic log observers.
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I{ILogObserver} that fans out events to other observers.
Keeps track of a set of L{ILogObserver} objects and forwards
events to each.
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Registers an observer with this publisher.
@param observer: An L{ILogObserver} to add.
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Unregisters an observer with this publisher.
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Forward events to contained observers.
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Add tracing information for an observer.
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Create an error-logger based on this logger, which does not contain the
given bad observer.
@param observer: The observer which previously had an error.
@return: A L{Logger} without the given observer.
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I{ILogObserver} that does nothing with the events it sees.
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