Add system log driver and use it by default

config.default.php

@@ -10,8 +10,8 @@ define('DATA_DIR', __DIR__.DIRECTORY_SEPARATOR.'data');
 // Enable/Disable debug
 define('DEBUG', false);
 
-// Available log drivers: syslog, stderr, stdout or file
-define('LOG_DRIVER', '');
+// Available log drivers: syslog, stderr, stdout, system or file
+define('LOG_DRIVER', 'system');
 
 // Log filename if the log driver is "file"
 define('LOG_FILE', DATA_DIR.DIRECTORY_SEPARATOR.'debug.log');