### Add interface for declaration of groups of endogenous variables or exogenous variables.
### Add an
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# Declaration of groups of variables
Add interface for declaration of groups of endogenous variables or exogenous variables. This is needed for variance/levels decompositions. We can use the same interface than for the declaration of ```long_names``` (see the reference [manual](http://www.dynare.org/manual/index_15.html). We could add a ```group``` keyword.
# Save all output in ```dseries``` objects.
See Dynare issue [#832](https://github.com/DynareTeam/dynare/issues/832). We can then apply available methods to save any output into xls or csv file.
