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Ref #512

With the former optimizer, the ML estimation under Octave would lead to a point
with a non-positive covariance matrix for shocks; in turn this would be an
unsuitable starting point for the subsequent Bayesian estimation

Fix typo in model_diagnostics.m

Ref. #511

Bugfixes for set_param_values and for purely static models

First step in #526

Change unit test for H-matrix to be positive definite

Conflicts:
	matlab/dynare_estimation_1.m
	matlab/global_initialization.m

Add function check_for_calibrated_covariances.m (missing in commit fddee8e1)

Closes #112, #514

Bugfixes for correlated shocks

Uses preprocessing capabilities introduced in 07137e80

Fixes #392 and #494. Also fixes a bug in the checking for positive definiteness of covariance matrices in likelihood functions

Allows for calibrated covariances by reading them out and setting them after covariance matrix has been reconstructed from correlation and variances.

Adds unit test

Add function to check covariances for consistency

adding comments

Add options for providing the variances, an identity matrix , and user specified matrices as proposal densities

Deals with #507 and #112
Includes a unit test

Closes #515