*2)* Added cell.ValueCached property that holds Excel's cache of formula evaluations.
*3)* Added the following properties to the worksheets:
ShowFormulas 
ShowGridLines 
ShowOutlineSymbols 
ShowRowColHeaders 
ShowRuler 
ShowWhiteSpace 
ShowZeros 
*4)* Added methods Worksheets.Add(DataTable), Worksheets.Add(DataSet). 
*5)* Fixed issues 6609, 6532, 6510, 6499, 6705, 6508
*Breaking Changes:* Removed static method XLWorkbook.GetXLFont(). When you add a header/footer text which you want to format just modify the rich text/font returned by the .AddText(...) methods.