Add SD-Card change and SD-Card init.

Add SD-Card change and SD-Card init. for reprap electronics without
SD-Chard change detect pin.

Marlin/ultralcd.cpp

@@ -199,9 +199,15 @@ static void lcd_main_menu()
             MENU_ITEM(function, MSG_STOP_PRINT, lcd_sdcard_stop);
         }else{
             MENU_ITEM(submenu, MSG_CARD_MENU, lcd_sdcard_menu);
+#if SDCARDDETECT < 1
+			MENU_ITEM(gcode, MSG_CNG_SDCARD, PSTR("M21"));	// SD-card changed by user
+#endif			
         }
     }else{
         MENU_ITEM(submenu, MSG_NO_CARD, lcd_sdcard_menu);
+#if SDCARDDETECT < 1		
+		MENU_ITEM(gcode, MSG_INIT_SDCARD, PSTR("M21"));	// Manually initialize the SD-card via user interface
+#endif		
     }
 #endif
     END_MENU();