Improve debugging options for perfect foresight

We occasionally have issues with singular Jacobians as in https://forum.dynare.org/t/blanchard-conditions-in-stochastic-and-deterministic-models/15980 It would be good to have a debugging options that would point to the culprit for e.g. a row or column of zeros. Maybe we could add this to model_diagnostics. Two test cases are attached, one for sim1 and one for sim1_linear.