dataset_ is a dseries and no longer a structure

Created by: thomasbrand

The last commits about dseries (between October 10th and October 14th) modified the type of the dataset_ output in results.mat. It was previously a matlab structure, and now it is a dseries. The consequence is important (for me) because now I need Dynare to read the dataset_ output.

Was it on purpose or do you think you will go back to a structure ?