#2 easy way to retrieve frequencies

[Adam Kiezun]

There's seems to be no easy way to retrieve population frequencies in a specific iteration.
--popFreq prints frequencies for alliterations together.

(Context: I'm trying to get the pop frequency for each mutation printed in convertSFS_CODE --AGE. I can focus the age calculation on a subset of iterations by using ITS <n> but the same is not easily doable for frequencies)</n>