Closes #1953

This partially reverts commit af274aec

fix to #1935. Forced options_.analytic_derivation=-1; must be set before entering dynare_minimize_objective

In situations where the solution cannot be found for an informational period > 1
using the same completion share as for the first informational period, suggest
to decrease the value of the homotopy_max_completion_share option.

Use the model simulation based on a first-order local approximation as
the initial guess for the nonlinear solver in each period. Can
speed-up extended path simulations.

We could also consider simulations based on higher order
approximations, but I did not find any significant improvements with a
second order approximation.

Closes #1946

Capitalization was wrong

Only try to compute planner welfare related to states if there are any

Erroneously triggered asymptotic Hessian via simulation

Fixes crashes in model_info with differentiate_forward_vars

Previously, “contains('foo\', '\')” would fail with an error, due to the
antislash not being escaped when calling the “regexp” function. Same for other
special characters in regular expressions (e.g. the dollar sign).

In particular, this bug would make Dynare unusable with Octave under
Windows (since commit e9d79796), because
Windows paths typically contain antislashes.

By the way, only create the dseries output of “perfect_foresight_solver” when
requested.

Related to Dynare/dynare!2226 (comment 20318)

Redundant due to noprint being set locally

Prevents crashes with smoothed_state_uncertainty option if MCMC smoother is run after classical one