Problem when reading nested structures.

Probably needs another option name...

where the integer part represents the period and the fractional part
the subperiod. Maybe we could think of a better name for the function.

Add more explicit error message if mod-file cannot be located of file in...

Let ts be a dynSeries object. The following syntaxes are equivalent:

a = ts.lead
a = ts(1)

b = ts.lag(2)
b = ts(-2)

Advantage: If (some of) the variables used in the model block are known as dynSeries in matlab's workspace, then we can create new dynSeries objects with simple copy/pastes of the model's equations (because dynSeries objects understands leads and lags as Dynare's preprocessor).

Changed the organization of the options for the dynare's implementation of the simplex optimization algorithm.

Changed the default value for the maximum number of iterations (defined in the dynare'es implementation of the simplex optimization algorithm).

Changed the definition of the maximum number of function evaluations in dynare'es iplementation of simplex algorithm (mode_compute=8).

Take care of NaN or Inf in residuals or endogenous values