Updated NEWS for 4.5.7.

(cherry picked from commit 798cecd8)

NEWS

+Announcement for Dynare 4.5.7 (on 2019-02-06)
+=============================================
+
+We are pleased to announce the release of Dynare 4.5.7.
+
+This is a bugfix release.
+
+The Windows packages are already available for download at:
+
+ http://www.dynare.org/download/dynare-stable
+
+The Mac and GNU/Linux packages (for Debian and Ubuntu LTS) should follow soon.
+
+This release is compatible with MATLAB versions 7.5 (R2007b) to 9.4 (R2018b)
+and with GNU Octave versions 4.4.1.
+
+Here is a list of the problems identified in version 4.5.6 and that have been
+fixed in version 4.5.7:
+
+ - The mex-file conducting the QZ decomposition erroneously applied
+   the `qz_criterium` to the square absolute value of eigenvalues
+   instead of the absolute value itself (as done in mjdgges.m and the
+   AIM solver).
+
+ - In pathological cases, `mode_compute=5` (`newrat`) might enter an
+   infinite loop.
+
+ - `discretionary_policy` might erroneously state that the derivatives
+   of the objective function are non-zero if there are NaN present.
+
+ - Dynare++, when conducting the QZ decomposition, erroneously applied
+   the `qz_criterium` to the square absolute value of eigenvalues
+   instead of the absolute value itself.
+
+ - Dynare++: IRFs were incorrectly computed.
+
+ - `dynare_sensitivity` did not display the figures of
+   `irf_calibration`, it only stored them on the disk.
+
+ - Scatter plots generated by `dynare_sensitivity` did not correctly
+   display LaTeX names.
+
+ - Parameter updating via steady state files did not correctly work in
+   case of using [static]/[dynamic] equation tags.
+
+ - Memory leaks in `k_order_pert` (used by higher order stochastic
+   simulations) could lead to crashes.
+
+ - Predetermined variables were not properly set when used in model
+   local variables.
+
+ - Posterior moment computation did not correctly update the
+   covariance matrix of exogenous shocks during posterior sampling.
+
+ - Dynare was crashing with a cryptic message if a non estimated
+   parameter was initialized in the `estimated_params_init` block.
+
+ - The `forecast` command crashed if the model was declared as linear
+   and contained deterministic exogenous variables.
+
+ - Block decomposition is broken when used in conjunction with
+   `varexo_det`.
+
+ - The model was not correctly specified when `identification` was run
+   without another stochastic command in the `.mod` file
+   (e.g. `estimation`, `stoch_simul`, etc.).
+
+ - Realtime annualized shock decompositions added the wrong steady state
+   value.
+
+ - `mh_recover` option crashed when using slice sampler.
+
+ - x-axis values in plots of moment restrictions were wrong for
+   autocovariances.
+
+
+
 Announcement for Dynare 4.5.6 (on 2018-07-25)
 =============================================