Read from and write to XLSX format files without any automation or export with support for full cell formatting in Excel

Bug fixes have been applied; see the Release Notes for explanations. Also, the reading of an existing spreadsheet has been extensively reworked to increase performance.

Bug fix for an obscure bug in the freeze rows/columns; see the Release Notes for explanations. Added several methods for handling the Print Area.

Bug fix when reading an existing workbook with cell values formatted as text. Corrected the read and write processing.

Gregory Green