Issue 19 solved

Revert the last Haptic changes (was unfinished, no more spare time during the week-end, sorry!)
Revert my last modification on main views (offset not displayed in Bar Graphs, I was wrong)
PPM Center now configurable for each servo
No mean on the Batt voltage when in the calibration menu to have a faster response when calibrating
SD card Backup / Restore Models feature started
Some french translations fixed

src/menus.h

@@ -186,4 +186,11 @@ void displayPopup(const pm_char * pstr);
 void displayWarning(uint8_t event);
 void displayConfirmation(uint8_t event);
 
+#if defined(SDCARD)
+#define MENU_MAX_LINES 4
+extern const pm_char * s_menu[];
+extern uint8_t s_menu_count;
+const pm_char * displayMenu(uint8_t event);
+#endif
+
 #endif