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- set xind_tick for very short time intervals in plots
- provisions for change in behavior of matlab bar function since R2017b

- wrong output list of evaluate_smoother (M missing_)
- realtime option must be  forced to be zero
- wrong name of option fig_names

This test, which is not run by the testsuite, fails.

preprocessor: add line number to field in structure that macro variables are saved to. #1564

Make Octave error message more constructive and informative

See the discussion at http://savannah.gnu.org/bugs/?52569

Cosmetic fix to error message

Add diffuse_filter as option to dynare_sensitivity

 - In the second output argument (a dseries object) where we store the baseline
   scenario for the endogenous variables we add the baseline for the exogenous
   variables).

 - In the third output argument (a structure of dseries objects, one field per
   shock scenario), we also store the impulses considered for generating the
   IRFs.

Correct setting of plot_shock_decomp.type

Closes #1548

Make isfile.m command work with Matlab versions before 9.1