message: Changing physics constants to 'const'
diff: @@ -34,9 +34,9 @@ namespace electromagnetics
  // Physical Constants
  // Permittivity of Free Space (units F/m)
  -static double epsilon0_ = 8.8541878176e-12;
  +static const double epsilon0_ = 8.8541878176e-12;
  // Permeability of Free Space (units H/m)
  -static double mu0_ = 4.0e-7*M_PI;
  +static const double mu0_ = 4.0e-7*M_PI;
  //class SurfaceCurrent;
  class HertzSolver
  