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Ref. #1859

Ref. #1859

Two bugfixes for 6.0

See merge request Dynare/dynare!2287

 disp_moments.m: fix crash in variance decomposition with measurement errors when zero variance shocks are present

In particular, adapt the manual and the testsuite.

Fix `simult_.m` to call specialized simulation codes for order <= 3 instead of...

See merge request Dynare/dynare!2286

Fix `simult_.m` to call specialized simulation codes for order <= 3 instead of `k_order_simul` whenever possible

Ref. #1859

The test condition was incorrect (though this was probably harmless).

Also the error message related to oo_.dr.ghu was incorrect.

By symlinking ~/.MathWorks to /dev/null, MATLAB is unable to copy and launch
the ServiceHost binary, which seems to cause lockups. See for example:
https://git.dynare.org/Dynare/dynare/-/jobs/62558
https://git.dynare.org/Dynare/dynare/-/jobs/62547

Bug fix in PAC/MCE expectation with cherrypick (was only affecting PAC models with transformed variables).

The RHS of the equation was not acknowledging the user provided name
for the auxiliary variable.

Closes: #1927

Closes: #1721

 make sure user-defined warning states are not overridden

See merge request Dynare/dynare!2285

warning_config.m should only be called once in dynare.m

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The initial guess was set to the solution, so the algorithms would really be
tested.