Rename worksheet.go and worksheet_test.go to xmlWorksheet.go and
xmlWorksheet_test.go to distinguish files handling the parsing of xml from
those providing higher level constructs.
Remove old worksheet.go and worksheet_test.go files.
Rename contenttypes.go to xmlContentTypes.go
Make a minor update to the docs
Split sharedstrings.go and renamed to reftable.go and xmlSharedStrings.go
Rename workbook.go xmlWorkbook.go
Modify references to XLSX documents to reflect their move to a subdirectory.
Drop execute permission that some files had
Drop execute bit from testdocs
Merge macExcel_test.go and googleDocsExcel_test.go into compatibility_test.go
Merge macNumbers into compatibility_test.go
Merge wpsBlankLine into compatibility_test.go
Renamed style.go to xmlStyle.go
Split cell.go into cell.go and style.go