 for 2nd order resp. coeff output function

 All output data are stored in a structure 'result' with fields:
   result.c            - Metabolite levels      
   result.c0           - Equilibrium metabolite levels      
   result.u            - Enzyme levels
   result.A            - Reaction affinities
   result.zeta         - zeta vector (computed from reaction affinities)
   result.mu           - Chemical potentials
   result.J            - Fluxes
   result.v            - Reaction rates (computed from rate