Add section about building simulations to the README
Compare lcfit to spline & poynomial
Use only highest likelihood points

When approximating the likelihood curve using additional points,
use only the four highest likelihood points for the fitting the
approximation.
Erick says of these new plots,
"Seems like the tails might dominate the error estimation."
"lcfit does a better job WRT KL when it only takes the highest 4 points!"