big change: MatrixBase only takes one template parameter "Derived", the

template parameter "Scalar" is removed. This is achieved by introducting a
template <typename Derived> struct Scalar to achieve a forward-declaration of
the Scalar typedefs.

doc/examples/class_CwiseUnaryOp.cpp

@@ -13,6 +13,6 @@ struct CwiseClampOp EIGEN_EMPTY_STRUCT {
 int main(int, char**)
 {
   Matrix4d m1 = Matrix4d::random();
-  cout << m1.cwise(CwiseClampOp<Matrix4d::Scalar>(-0.5,0.5)) << endl;
+  cout << m1.cwise(CwiseClampOp<double>(-0.5,0.5)) << endl;
   return 0;
 }