omitting -Wcast-qual from CXXFLAGS to avoid verbose Eigen warnings
creating getters and setters for parameter elements
allow setting of single parameter elements (for matrices and vectors)

Now constraints of the form

  HighScaleInput = {
     {me2[1,1], 2 m0^2 Ye[1,1]},
     {me2[2,2], 3 m0 T[Ye][2,2]}
  };

will be translated into

  MODEL->set_me2(0, 0, 2*Sqr(m0)*Ye(0,0));
  MODEL->set_me2(1, 1, 3*m0*TYe(1,1));