HAL_Linux: fixed stopped clock delay
AP_NavEKF: fixed log playback for copter
AP_InertialNav: make some functions protected
AP_Baro: changed HIL driver to use floats and better handle starup
AP_NavEKF: some debug code
AP_NavEKF: handle intertial nav
AP_NavEKF: useful plotting function
AP_NavEKF: improved playback initialisation