#968 Change Kernel PCA to use tapkee 

// For KPCA
  Modify apply_to_feature_matrix()
         apply_to_feature_vector()
         apply_to_string_features()
          init((CFeatures* features))
  Add    fill_projected_data
  Change to use tapkee to caculate embedding
                 transformation_matrix = tapkee_embedding
         Stop "Subtracting mean from transformation_matrix"
   // For tapkee interface
    Add calc_projecting_function for returning ProjectingFunction
    Add prepare_tapkee_parameters_set for setting parameters