docs: public void removeWriter(String logService, LogWriter writer)
  	{
  		if (logService != null && logService.length() > 0) {
  			final LogService l = (LogService) loggers.get(logService);
  			if (l != null)
  				l.removeWriter(writer);
  		}
  		else
  			synchronized (loggers) {
  				if (writers.remove(writer))
  					for (final Iterator i = loggers.values().iterator(); i.hasNext();)
  						((LogService) i.next()).removeWriter(writer);
  			}
  	}