[VN100-SPI] Correctly samples accelerometer, gyroscope, magnetometer, quaternion, temperature and pressure data.

[VN100-SPI] Fixed sensor initialization. The first read from the sensor could have failed because of junk, that is now removed thanks to sendDummyPacket().

[CountedPWM] Non resetting the pulse counter so that we won't be stuck if we call generatePulses too frequently

Inverted latitude and longitude to print them in the right position