New growth rate calculation #59
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Calculates new town growth rate based on missing cargo percentage.
Firstly a maximum growth rate for the town is calculated with g_factor being the growth rate at 0 population. The growth rate is faster the bigger the town is. The decline is slow enought to have reasonable growth rate even for bigger towns.
An exponential extra growth is calculated based on missing cargo requirements. The extra growth rate factor is multiplied by the difference between lowest TGR and maximum TGR to get extra growth rate in days. The effect of missing cargo decreases with higher fulfillment, but is still significant.
The resulting growth rate is the combination of both factors, the max growth rate and the extra growth rate.