v4.1: added to preprocessor int NNZDerivatives[3] with number of non-zeros...

v4.1: added to preprocessor int NNZDerivatives[3] with number of non-zeros derivatives at order 1, 2, and 3
      used it to initialize sparse g2 and g3 in Matlab <modfile>_dynamic.m


git-svn-id: https://www.dynare.org/svn/dynare/trunk@2668 ac1d8469-bf42-47a9-8791-bf33cf982152