Addlbfgs

Ah! Stupid floating point noise!

At the end:
Gradient: [-1.3677947663381929e-13 7.549516567451064e-14 -1.1457501614131615e-13 -2.7755575615628914e-14]
Location.F: 3.7014286104300176 
optLoc.F: 3.701428610430017

Perhaps we should use the same check in Update as we do in Bisection. This is certainly a surprising result.