title: python xlutils : formatting_info=True not yet implemented
body: <p>I've got simple code to copy files with xlutils, xlrd, xlwt (downloaded new libraries from python-excel.org) with not loosing formatting. I've got an error as below:</p>
  
  <pre><code>from xlwt.Workbook import *
  from xlwt.Style import *
  from xlrd import open_workbook
  from xlutils.copy import copy
  import xlrd
  
  style = XFStyle()
  rb = open_workbook('file_master.xlsx', formatting_info=True)
  wb = copy(rb.get_sheet(0))
  
  new_book = Workbook()
  w_sheet = wb.get_sheet(0)
  w_sheet.write(6,6)
  
  wb.save('new_file_master.xls')
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code> raise NotImplementedError("formatting_info=True not yet implemented")
  NotImplementedError: formatting_info=True not yet implemented
  </code></pre>
  
  <p>Could you please help me how to work around this or rather make it work?</p>