Issue 1069: Add FDOA measurement class
I've added an FDOA measurement class and tests.
The tests currently pass, but I'm not happy with the thresholds that I've had to put on the comparisons. I suspect that I have made a mistake in either the FDOA implementation, or the alternative calculations in FDOAMeasurementCreator, but I can't see it.
Note that this class is really just a mashup of TDOA and BistaticRangeRate. I have only added a small amount of new code.