Was crashing if the auxiliary model contains a constant.

See https://forum.dynare.org/t/iterative-ols-for-pac-equation/21379.

Fix: scale the matrices in tests/riccatiupdate.m to control the size of errors

See merge request Dynare/dynare!2108

Ref. !2105

Ref. !2103

Also capitalize MATLAB.

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NEWS.md: release notes for 5.3

See merge request Dynare/dynare!2107

Related to 178e892e

big fix in diffuse filter initialization:

See merge request Dynare/dynare!2104

big fix in diffuse filter initialization: incorrect mapping of observables when removing zero columns of T

(cherry picked from commit 7c4c0fe4)

OccBin Smoother: do not write non-converged results to oo_

Closes #1863

See merge request Dynare/dynare!2100

Closes Dynare/dynare#1863

Implements a Fortran update of the states variance-covariance matrix for the Kalman filter

See merge request Dynare/dynare!2099

Ref. !2101

missing line that stores info on violation of constraint in expectation (needed to check for periodic solutions)

– use_dll: fix race condition with compilation of power_deriv.{c,h}
– Performance improvement of chain rule derivation, using caching

Manual: fix typo

See merge request Dynare/dynare!2098

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Adapted from the Contributor Covenant Code of Conduct version 2.1.

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Ref. !2095

Ref. #1859

Ref. !2096