Use a calculated population max rather than a sample max

[damonhook]

API

• Use a calculated population max (The actual max) rather than basing it on the max value of the simulated sample (fixes: Programatically determine the max (and not rely on simulations for it) #30)
• Remove Median as the way the data is distributed, it is usually extremely close to mean anyway
• Calculate frequency table on the fly, rather than creating a large results array first (fixes Don't keep simulation results in array (Memory optimisation) #32)