* 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/Cwise.h

@@ -48,7 +48,10 @@
   *
   * Note that some methods are defined in the \ref Array module.
   *
-  * \sa MatrixBase::cwise()
+  * Example: \include MatrixBase_cwise_const.cpp
+  * Output: \verbinclude MatrixBase_cwise_const.out
+  *
+  * \sa MatrixBase::cwise() const, MatrixBase::cwise()
   */
 template<typename ExpressionType> class Cwise
 {
@@ -133,7 +136,10 @@ template<typename ExpressionType> class Cwise
 
 /** \returns a Cwise wrapper of *this providing additional coefficient-wise operations
   *
-  * \sa class Cwise
+  * Example: \include MatrixBase_cwise_const.cpp
+  * Output: \verbinclude MatrixBase_cwise_const.out
+  *
+  * \sa class Cwise, cwise()
   */
 template<typename Derived>
 inline const Cwise<Derived>
@@ -144,7 +150,10 @@ MatrixBase<Derived>::cwise() const
 
 /** \returns a Cwise wrapper of *this providing additional coefficient-wise operations
   *
-  * \sa class Cwise
+  * Example: \include MatrixBase_cwise.cpp
+  * Output: \verbinclude MatrixBase_cwise.out
+  *
+  * \sa class Cwise, cwise() const
   */
 template<typename Derived>
 inline Cwise<Derived>