id_to_unit() generates a 'unit' condition for SWATrunR parameter
definitions from an ID vector. This is useful when e.g. a vector of HRU IDs
is given and a parameter change change should be defined for those units
id_to_unit() generates a 'unit' condition for SWATrunR parameter
definitions from an ID vector. This is useful when e.g. a vector of HRU IDs
is given and a parameter change change should be defined for those units