allow multiple outputs from routing #47
Description
Currently, only routing functions that return only X will work.
Would ideally like to allow multiple (related) outputs, e.g.
- Xs and Xq from return_components=T in cmd.sim
- groundwater levels
- stage
This could be done by providing an additional OUTPUT variable, which could be referred to in the objective function.
This would allow hydromad to be used without producing X at all. This might break some other functions?