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occbin enhancements and bug fixes

See merge request !2123

- 321 when simulation within occbin smoother fails
- 322 when occbin smoother does not converge.

bug fix and avoid missing output arguments and when smoother exits after non convergence of simulation.

make sure also ALL updated variables in period 1 are reconstructed with smoother_redux. test model changed accordingly.

eliminate buggy and useless check for existence of guess regime variable. this may create bugs in running PKF update step!

adjust smoother redux test, to consider that now ALL smoothed variables must be properly reconstructed also in period 1

- allow having binding regimes in period 1 with occbin
- further improve recovering of smoothed variables in period 1 under smoother_redux option

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As a consequence, increase the tolerance for a test with mfs=3 (it now uses the
same tolerance as the corresponding test for mfs=2).

Closes: #1883

Closes: website#3

– Drop dynamic_g1_nz.m generated file
– Fix size of dynamic derivatives (legacy representation) when there are unused
  exogenous and “nostrict” option is given
– Block decomposition: another fix for sparse indices of static Jacobian when
  mfs > 0

This can prevent mistakes when the array is modified.

Ref. #1859

missing_observations_kalman_filter.m: provide debugging information on PKF problems

See merge request !2122

As a consequence, fix steady state computation when mfs > 0.

E.g. indentation was incorrect following “model(block);”.

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