Errors in lifecycle case

I'm getting NaNs when initialising the lifecycle case:

```
Found NaN in T_n
s 7224.352182
qt 0.004356
p0 80609.818223
T_1 398.995563
T_2 -nan
f_1 -inf
f_2 -inf
L_2 2109562.072012
sigma_2 0.004356
lam_2 1.000000
s_2 inf
count 1
```

Reproduce the lifecycle-case initialization using the parameters and output shown in the report, then trace the first NaN at T_2 and the subsequent infinities. Compare the calculations involving T_2, f_1, f_2, L_2, sigma_2, lam_2, and s_2; done means the case initializes without NaN or infinity.

Written by the indexing model from the issue text.