Groundwater: Improvement of yearround calculations

Improvement for realistic simulation year round groundwater under wet circumstances (e.g. Peat meadows). Adjustment of het averaging algorithm such that only in case water on land is higher than a certain treshold (e.g. 1 cm), this water is taken into account in the ‘average area’. This means that on the one hand rain ‘has enough time’ to infiltrate, but on the other hand that if there is too much water this will flow towards a waterway. this way, ground level storage is ‘created’ for the Averaging Water Overlay.

Also, improvements in terms of performance (calculation time) have been made, and more detail is added to the crop factor, which can now differ for different times of the year.