anchor.diff:  /// `pivotTable` implements the pivoting operation [as documented in the 
   /// tutorials](../frame.html#pivot).
   ///
  -/// The `pivot` and `melt` functions turn the data frame into a single data frame
  +/// The `melt` and `unmelt` functions turn the data frame into a single data frame
   /// containing columns `Row`, `Column` and `Value` containing the data of the original
   /// frame; `melt` can be used to turn this representation back into an original frame.
   ///
  
positive.code:   /// respectively.
    ///
    /// [category:Grouping, windowing and chunking]
    [<CompiledName("Pivot")>]
    let pivot (frame:Frame<'O, string>) : Frame<'R, 'C> =
      FrameUtils.fromValues frame.Rows.Values 
        (fun row -> row.GetAs<'C>("Column"))
        (fun row -> row.GetAs<'R>("Row"))
  
negative.code:   /// respectively.
    ///
    /// [category:Grouping, windowing and chunking]
    [<Obsolete("The Frame.UnStack method has been renamed to Frame.Unmelt")>]
    [<CompiledName("UnStack")>]
    let unstack (frame:Frame<'O, string>) : Frame<'R, 'C> = unmelt frame
  
    // ----------------------------------------------------------------------------------------------
    // Sorting and index manipulation
  