4.1 branch: merged r3275 (added error message for 2nd or 3rd order...

4.1 branch: merged r3275 (added error message for 2nd or 3rd order approximation of purely backward models)

git-svn-id: https://www.dynare.org/svn/dynare/branches/4.1@3278 ac1d8469-bf42-47a9-8791-bf33cf982152