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Conflicts:
	preprocessor/DynareBison.yy

Conflicts:
	preprocessor/DynareBison.yy
	preprocessor/DynareFlex.ll
	preprocessor/macro/MacroFlex.ll

The default value of the file name (without extension) was wrong when the method was called with the dot notation.

Changed behaviour of @dseries/pop method. If only one argument is provided, remove the last variable.

Closes #498

Ref #512

With the former optimizer, the ML estimation under Octave would lead to a point
with a non-positive covariance matrix for shocks; in turn this would be an
unsuitable starting point for the subsequent Bayesian estimation

Removed some restrictions in @dseries/eq overload operator: the variables in the compared dseries object need not to have the same names.

Changed x-labels in plot (with dates). Added commands for saving the generated plot in the unitary test of @dseries/baxter_king_filter.

Fix typo in model_diagnostics.m