Add unit tests to cover some of the FlightData object and
some of the calculations. This specifically covers the bits
for FlightData.getGroundHitVelocity() where the ground hit
velocity is calculated from a FlightDataBranch consisting
of a series of data points and events occuring during flight.
Signed-off-by: Billy Olsen <billy.olsen@gmail.com>
ddfe7c5c90