+ *
+ * cfdeffile contains filename of config file automatically loaded before a
+ * first --set option is executed. If none --set option occures, it will be
+ * loaded after getopt returns -1 (at the end of configuration options). It
+ * will be ignored, if another config file is set by --config option at first.
+ * Its initial value is DEFAULT_CONFIG from config.h, but you can override it
+ * manually.