last small fixes, this is alpha6, eigen2 is now ready for eigen1 apps to

port to.

Eigen/src/Core/MatrixBase.h

@@ -462,6 +462,9 @@ template<typename Derived> class MatrixBase
     template<typename NewType>
     const CwiseUnaryOp<ei_scalar_cast_op<typename ei_traits<Derived>::Scalar, NewType>, Derived> cast() const;
 
+    /** \returns the matrix or vector obtained by evaluating this expression.
+      *
+      */
     EIGEN_ALWAYS_INLINE const typename ei_eval<Derived>::type eval() const
     {
       return typename ei_eval<Derived>::type(derived());