trunk preprocessor:

* fail if no. of equations is different from no. of endogenous (unless ramsey_policy is used)
* more fields in the ModFileStructure class
* cosmetic changes


git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@2121 ac1d8469-bf42-47a9-8791-bf33cf982152