Build 5.0.0.38 of xlsgen improves outlines (cell grouping) in a number of ways :

- in worksheet Duplicate scenarios, under certain circumstances, existing outlines were not carried over

- in XLSB files, outline levels were not properly written back to the file

- exposure of outline level in Rows or Columns :

enumOutlineLevel level = worksheet.Rows("12:12").Outline; // returns the outline level of row 12

enumOutlineLevel level = worksheet.Rows("12:15").Outline; // returns the max outline level in rows 12 to 15