OccBin estimation with two occasionally binding constraints

@rattoma I was struggling with submitting the following bug report for OccBin.solve_two_constraints:

  ▎ Title: occbin.solve_two_constraints line 237: dimension mismatch when max_check_ahead_periods is finite                                 
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  ▎ Version: Dynare 7.0                                                                                                                     
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  ▎ File: matlab/+occbin/solve_two_constraints.m, line 237                                                                                  
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  ▎ Bug: When opts_simul_.max_check_ahead_periods < length(binding_indicator), the if branch on line 217 truncates binding_constraint_new   
  ▎ (line 224) and my_binding_indicator (line 226) to length 2*end_periods. Lines 232–234 correctly use the truncated                     
  ▎ my_binding_indicator(:) for the regime-change check. But line 237 references the un-truncated binding_indicator(:) (length              
  ▎ 2*(nperiods_0+1)), so the & operator throws Arrays have incompatible sizes.                                                           
  ▎
  ▎ Fix: Change binding_indicator(:) → my_binding_indicator(:) on line 237.                                                                 
  ▎
  ▎ Sibling for reference: solve_one_constraint.m:212 does the equivalent comparison correctly with truncated arrays on both sides.         
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  ▎ Reproducer: any 2-constraint OccBin model run through likelihood_piecewise_kalman_filter with a finite                                  
  ▎ options_.occbin.likelihood.max_check_ahead_periods smaller than the binding horizon.   

Maybe you or @jpfeifer could submit this report and look into it?