to_excel : Excel Writer output limit 65,536
Excel supports 1e6 rows with .xlsx files. I'm using to_excel  for a dataframe with >65,535 rows and am getting the error, User Warning ... since it exceeds Excel's limit of 65,530 'items' per worksheet. Are there any options that allow > 65K rows with .xlsx output files? BTW: to_csv works correctly.
