* @param $log string: 'production' will always trigger a php error, 'auto'
* will trigger an error if $wgDevelopmentWarnings is true, and 'debug'
* will only write to the debug log(s).
* @param $log string: 'production' will always trigger a php error, 'auto'
* will trigger an error if $wgDevelopmentWarnings is true, and 'debug'
* will only write to the debug log(s).