Group setup
Format matches actuary.py: list ages with m/f suffixes (decimals ok). If you include a trailing number, it is treated
as the years to simulate; if that number exceeds the current calendar year, it is interpreted as an absolute year.
If you omit the number, the default horizon is 1 year.
Probabilities
Waiting for input.
Within selected horizon
--
Chance someone dies
--
Chance everyone dies