New on this release:
1) Major performance improvements on load and save.
2) Fixed range.RangeUsed when no cells were used.
3) Added methods row.AddHorizontalPageBreak and column.AddVerticalPageBreak
4) Added properties worksheet.TabSelected, worksheet.TabActive
5) Creation of non existing directories in XLWorksheet.Load and XLWorksheet.SaveAs
6) Added property Count to IXLWorksheets
7) Added method TryGetWorksheet to IXLWorksheets
8) Added method range.SetDataType(...)
9) Cell contents formatted with @ will be treated as text
10) Fixed issue with XLColor.GetHashCode()
11) Fixed issue when deleting rows from a workbook loaded.
12) Fixed issues 6804, 6817