- fix handling of auxiliary variables related to lagged endogenous
- add preprocessor interface
- add histval_file
- add tests (for smoother2histval with outfile, and for histval_file)
- Support saving to an output MAT file.
- Handle smoothed variables computed by a Metropolis, by adding support for the
parameter_set option.
- When an auxiliary variable is not in the output model, emit a warning instead
of stopping with an error message (aux vars may be different between input
and output models, even if the equations are identical).
Ref #594