* doc improvements in Cwise and PartialRedux:

- 33 new snippets
  - unfuck doxygen output in Cwise (issues with function macros)
  - more see-also links from outside, making Cwise more discoverable
* rename matrixNorm() to operatorNorm(). There are many matrix norms
  (the L2 is another one) but only one is called the operator norm.
  Risk of confusion with keyword operator is not too scary after all.

Eigen/src/Core/Product.h

@@ -261,7 +261,9 @@ template<typename LhsNested, typename RhsNested, int ProductMode> class Product
 
 /** \returns the matrix product of \c *this and \a other.
   *
-  * \sa lazy(), operator*=(const MatrixBase&)
+  * \note If instead of the matrix product you want the coefficient-wise product, see Cwise::operator*().
+  *
+  * \sa lazy(), operator*=(const MatrixBase&), Cwise::operator*()
   */
 template<typename Derived>
 template<typename OtherDerived>