v4 doc: enhanced build system for all documents (except the userguide which we...

v4 doc: enhanced build system for all documents (except the userguide which we can't recompile at this stage, since some components are lacking in the SVN)


git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1948 ac1d8469-bf42-47a9-8791-bf33cf982152