[DynareDev] Preprocessor and g++

Hi, In my last commit, I use an extension of the C++ standard template library that is only implemented in g++ (and also in a few other compilers). Practically, that means that currently the preprocessor cannot be compiled with a compiler different from g++. Is this a problem for you? If it is, then I can provide an alternative implementation of this extension, for compilers other than g++. -- Sébastien Villemot