title: How to apply format as 'Text' and 'Accounting' using xlsxwriter
body: <p>I have been using xlsxwriter for a while and find it to be really helpful.
  I have used it for multiple purposes like custom data validation, custom formats etc
  However there are two things i am not able to perform.</p>
  
  <ol>
  <li><p>set format of a cell to 'text' and not 'general'. i have tried the apis write_string, write_blank but they always apply the format general</p></li>
  <li><p>set format as accounting. i have tried add_format({'num_format': '#,###'}. but this simply sets the format as 'custom' instead of accounting</p></li>
  </ol>
  
  <p>Please help.</p>