Changes for EKF integration testing

1) Motion compensation is not applied
2) Output rate is changed to 10Hz
3) Output data has been repurposed so that what is output on the raw flow message is the gyro angular rate in mrad/sec about the X and Y sensor axis
4) Output data has been repurposed so that what is output on the velocity message is the optical flow angular rate in rad/sec which is equivalent to velocity / range
5) Gyro angle rate, optical flow angle rate and quality measurements are all averaged using measurements summed when valid flow readings were available.