The Lagrange point calculation is still not finished,
but L1 and L2 are working. L3 is probably correct, but there
is no test data for it.
I replaced the test data with new JPL Horizons output that
is centered on the primary body instead of the Solar System Barycenter.
This allows Astronomy_LagrangePoint() to be agnostic about
the coordinate systems of the state vectors handed to it.
I still need to get L4 and L5 calculations to match JPL Horizons
data, but it is not yet clear how to do that.
Added data for testing Lagrange point calculations,
which has yet to be implemented. JPL Horizons
provides L1, L2, L4, and L5 (but *not* L3) calculations
for:
Sun / EMB
Earth / Moon
where EMB = Earth/Moon Barycenter.
