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Testsuite: use default number of particles when comparing performance of the various state space iteration MEX

The correction for growth neutrality should be substituted in the optimal part
of the PAC equations.

(cherry picked from commit 12694ff9347b2191b4e0f6a32cb038956cb38f53)

- Force long run levels of the exogenous variables to be zero or g (the BGP growth rate of the LHS endogenous variable).
- Fix the correction of the correction for the share λ (aak γ).
- Provisions for the case where the long run level of the exogenous variable is
different from 0 or g (see tmp1 and ll which should be added to the growth
neutrality correction as a constant).

(cherry picked from commit a4423d734e1df1d4ee09c7225d7fd610e0d94cd1)

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Ref. !1946

local_state_space_iteration_2 MEX: error out properly when trying to use with BLAS+MATLAB+parallelization

By the way, rename the C preprocessor symbol so that it is undefined by
default.

Expand Ramsey tests and fix consistency of utility and welfare

Closes #1821

See merge request Dynare/dynare!1945

Normann Rion authored Oct 18, 2021 and Johannes Pfeifer committed Oct 18, 2021

Fixes the evaluate_planner_objective routine Deals properly with the output provided by disp_th_moments

Also increase variance to make tests more challenging

The code that computes ghx·yhat+ghu·u (both with and without pruning) was
making the implicit assumption that q⩽n, i.e. that the number of shocks is less
than or equal to the number of states. If q>n, it would try to read invalid
memory references in ghx and yhat, and would thus either crash or return dummy
results.

Closes: #1820

Ref. !1944

estim_params_ needs to be saved following 6e06acc7

k_order_simulation bug: fixes simulations and adds/corrects integration test

Closes #1819

See merge request Dynare/dynare!1940

Closes Dynare/dynare#1819

Also decreases approximation order for speedup

Ref. !1943

Ref. !1942

Ref. !1941

display_problematic_vars_Jacobian.m: fix display when auxiliary equations outside of Ramsey are present

The Octave package for Windows ships with libgfortran from gfortran 9. This
version of libgfortran does not include symbol _gfortran_os_error_at, which is
needed by binaries created with gfortran 10 (used on our runners). The solution
is to statically link against libgfortran (as we already do for libgcc and
libstdc++).

– PAC: better error message in case of name conflict for the PAC growth
  neutrality correction parameter
– improve message for GCC installation under macOS

We no longer distribute our own Dynare/Octave package. We rather recommend the
Homebrew package.

Since debhelper 11, docs are under /usr/share/doc/dynare/.

However there still exists a 32-bit MinGW environment, installed along the
64-bit one by the 64-bit installer.

– Windows 11 is supported
– macOS versions older than 11 are no longer supported
– Octave versions older than 6.2.0 are no longer supported
– do not claim compatibility with future (unknown) versions of MATLAB and Octave

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