allow Dead_removal to be a value other than 1 #73
Description
Currently, reducing the Dead_removal fraction effectively reduces the urban forest area that experiences mortality.
The mortality fraction has to remain as it is in the mortality code, and then the mortality carbon has to be determined from the 'unmanaged' area. This is because the harvested pathway only operates on the 'managed' area.
The weighting of the mortality seems to be ok, as it adjusts the average mortality across managed and unmanaged land.