CalculateCost 
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This will update a Cost array index as a linear combination of length and time:
Cost(*,costindex) = weightlength * Length(*) + weighttime * Time(*, timeindex)
Syntax: CalculateCost(costindex: integer; weightlength, weighttime: TCost; timeindex: integer; maxspeed: TCost)
Call CreateArrayCost in advance to allocate the index.
Timeindex points to one of the arrays defined through CreateArrayTime. If weighttime = 0, value of timeindex is ignored.
If both weights are <> 0, we recommend setting weighttime = 1. This ensures the values can be interpreted as time easily and be used together with turn delays if needed.
If maxspeed is defined, then time is adjusted according to that.
