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Fixes local_state_space_iteration_3 and adds a test comparing the various pruning routines

Normann Rion requested to merge normann/dynare:pruning_2nd_order into master

Fixes local_state_space_iteration_3 and adds a test comparing the various pruning routines used in dynare up to order 3. The considered pruning routines can be found in

  • simult_.m
  • local_state_space_iteration_2 MEX
  • local_state_space_iteration_3 MEX
  • pruned_state_space_system.m

I wrote a note to clarify the elements we shared in Mattermost Town Square channel about pruning. In short, every thing is fine in dynare's pruning, except local_state_space_iteration_3, which I fix here: KKSS and AVR are equivalent at second order if proper summation is enforced in AVR. See KKSS_AVR_equivalence.pdf for more details.

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