1.3.7

• Fix IBM s390x.
• Fix header line no and sheet checkout not init line no.
• Fix single instance opens multiple files, but the file handle is not released.
• Feat worksheet printed.
• Feat worksheet hidden.
• Feat workbook custom first worksheet.
• Feat custom skip hidden rows.
• Feat skip empty rows.
• Feat set global type.
• Feat url text and tool tip.
• Feat work sheet protection.
• Helper xlswriter_get_version and xlswriter_get_author