Improving #107 based on Jussi's comments. Removing un_commodity from input files - the set is formed based on commodity set as well as p_gnu (it has to have capacity, unit_size or conversionCoefficient). Also, removed automatic calculation of p_uStartupFuel -> it needs to be in sheet p_uStartupFuel even if there is only 1 startup fuel (use fixedFuelFraction = 1)!