CMiscMenue: add entry for temporarily debug mode settings

Option "Level" overwrites assigned debug level output mode of Neutrino
start parameters, but only temporarily till change of options by user
or restart of Neutrino.

src/system/debug.h

@@ -27,9 +27,15 @@
 
 extern int debug;
 
-#define DEBUG_NORMAL	0
-#define DEBUG_INFO	1
-#define DEBUG_DEBUG	2
+enum
+{
+	DEBUG_NORMAL	, // 0
+	DEBUG_INFO	, // 1
+	DEBUG_DEBUG	, // 2
+
+	DEBUG_MODES	  // 3 count of available modes
+};
+
 
 void setDebugLevel( int level );