Added GDD growth stage calculation over all simulation years #154
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Added new version of Sugar Beet crop parameters, in accordance with calibrated changes made by Garcia-Vila et al., 2019.
Added fn to calculate GDD growth stages based on mean of all years of weather data, rather than just the first year (can also be median). Use 'gdd_switch_type' as a Crop attribute to select either 'mean' or 'median'. 'mean' is default.
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Can now use a new crop attribute 'gdd_switch_type'. When SwitchGDD is used to switch calendar day growth stages to GDD growth stages, the previous version only used weather from the first simulation year. Now, by default, the GDD equivalent values for each growth stage are calculated for every year in the simulation. The final GDD growth stage values are then calculated as the mean across all years. This can be changed to 'median' by specifying "gdd_switch_type = 'median'" in the Crop object specification.