Heritability added incorrectly

[RossDeVito]

In the paper and implementation you add noise to the genetic component of the phenotype to reach a desired heritability using:

g' = h * g + sqrt(1-h^2) N(0, 1), where h = heritability

There may have been confusion due to heritability typically being written as h^2, but the correct equation should be:

g' = sqrt(h^2) * g + sqrt(1-h^2) N(0, 1), where h^2 = heritability

or

g' = sqrt(h) * g + sqrt(1-h) N(0, 1), where h = heritability

[RossDeVito]

I have a branch that fixes this, but it doesn't seem like I have permission to push

[RossDeVito]

Here is the fix: 13315fa

[RossDeVito]

#14