1) Still some errors in dsgelikelihood are present that are not trapped: use...

1) Still some errors in dsgelikelihood are present that are not  trapped: use try catch when evaluating target function;
2) proposal density should contain the jscale.

git-svn-id: https://www.dynare.org/svn/dynare/trunk@3077 ac1d8469-bf42-47a9-8791-bf33cf982152