Automatically configures the log4net system based on the application's configuration settings.
Each application has a configuration file. This has the same name as the application with '.config' appended. This file is XML and calling this function prompts the configurator to look in that file for a section called
log4net that contains the configuration data.
To use this method to configure log4net you must specify the Log4NetConfigurationSectionHandler section handler for the
log4net configuration section. See the Log4NetConfigurationSectionHandler for an example.