v4.1: Added posterior IRFs for bvar a la Sims (not yet ready. Results are not...

v4.1: Added posterior IRFs for bvar a la Sims (not yet ready. Results are not saved in oo_, more general identification conditions should be allowed, and the code has to be tested).

git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@2059 ac1d8469-bf42-47a9-8791-bf33cf982152