public TaskDocumentWriter()
{
Customers = new Dictionary<int, string>();
Farms = new Dictionary<int, string>();
Fields = new Dictionary<int, string>();
Crops = new Dictionary<int, string>();
CropVarieties = new Dictionary<int, string>();
Products = new Dictionary<int, string>();
Workers = new Dictionary<int, string>();
UserUnits = new Dictionary<int, IsoUnit>();
Ids = new Dictionary<string, CompoundIdentifier>();
}