title: Golang Excelize: how to set cell value with row nmber and column number
body: <p>I am trying to write a function that writes a string array to excel in Go, using Excelize.
  My question: how to address a cell with row number and col number, instead of the "A1" type of syntax for the "axis" parameter ?</p>
  
  <pre><code>// Writes the header of the file:  
  xlfile.SetCellValue("Sheet1", "A1", "1")
  
  // Instead of "A1", I would like to use row number and col number as parameters
  </code></pre>