config::Save() and config::SaveMPQC() now take string for filename, instead of opened ofstream.
This was necessary, as config::SaveMPQC() now writes to files: One with hessian calc enabled, the other not. As it is a pendant of config::Save(), this file was changed accordingly. Both are called from builder.cpp (ParseFromParamters() and main()) and moleculelist.cpp (MoleculeListClass::OutputConfigForListOfFragments()), hence these were changed,too.