title: create a copy of xlsx file having all formula's within removed
body: <p>can't copy xlsx and xlsm files with xlrd as it says "formatting info= True" not yet implemented and
  openpyxl runs out of memory when doing the following:</p>
  
  <pre><code>import xlrd
  from xlutils.copy import copy
  from openpyxl import load_workbook
  
  if file_format == 'xls':
          input_file=xlrd.open_workbook(input_file_location,formatting_info=True)
          wb = copy(input_file)
          wb.save(destination_file)
  if file_format == 'xlsx' or file_format == 'xlsm' :
          input_file  =  load_workbook(input_file_location,data_only=True)
          input_file.save(destination_file)
  </code></pre>