-`discretionary_policy` is now able to solve nonlinear models (it will then use their first-order approximation, and the analytical steady state must be provided) (!1792)
-`evaluate_planner_objective` now works with 2nd order approximation (!1828)
-`evaluate_planner_objective` now works with 2nd order approximation (!1828) and with perfect foresight (!1833)
- Option `block` of `model` can now be used in conjunction with `use_dll`
