ENH: (Visu Refactoring) Removing histogram generation from image layer generator

Code/VisuRefac/otbImageLayerGenerator.h

@@ -27,8 +27,8 @@ namespace otb
 /** \class ImageLayerGenerator
 *   \brief Helper class to generate image layer for visualization.
 *   This class is a helper class for displayable layer generation.
-*   It generates a layer with all the needed information, histograms 
-*   and optionnaly quicklook.
+*   It generates a layer with all the needed information and
+*   optionnaly quicklook.
 *
 *   It ca also suggest a subsampling rate if a user want to generate
 *   the quicklook by itself. 
@@ -120,11 +120,6 @@ protected:
    */
   virtual void GenerateQuicklook();
 
-  /**
-   * Generate histograms.
-   */
-  virtual void GenerateHistograms();
-
 private:
   ImageLayerGenerator(const Self&);     // purposely not implemented
   void operator=(const Self&);          // purposely not implemented

Code/VisuRefac/otbImageLayerGenerator.txx

@@ -66,9 +66,6 @@ ImageLayerGenerator<TImageLayer>
     // Generate it
     this->GenerateQuicklook();
     }
-
-  // Generate histograms
-  this->GenerateHistograms();
 }
 
 template < class TImageLayer >
@@ -170,14 +167,6 @@ ImageLayerGenerator<TImageLayer>
     }
 }
 
-template < class TImageLayer >
-void
-ImageLayerGenerator<TImageLayer>
-::GenerateHistograms()
-{
-  /// TODO: Implement histogram generation
-}
-
 template < class TImageLayer >
 void
 ImageLayerGenerator<TImageLayer>