title: CellStyle.setAlignment(HorizontalAlignment.CENTER) error
body: <pre><code>CellStyle stringStyle = workbook.createCellStyle();
  stringStyle.setAlignment(HorizontalAlignment.CENTER);
  </code></pre>
  
  <p>this code produces error:</p>
  
  <blockquote>
    <p>method setAlignment in interface CellStyle cannot be applied to given types;</p>
    
    <p>required: short</p>
    
    <p>found: HorizontalAlignment</p>
    
    <p>reason: actual argument HorizontalAlignment cannot be converted to short by     method invocation conversion</p>
  </blockquote>
  
  <p>so I change the code to use a short:</p>
  
  <pre><code>CellStyle stringStyle = workbook.createCellStyle();
  stringStyle.setAlignment((short)1);
  </code></pre>
  
  <p>And my IDE complains saying:</p>
  
  <blockquote>
    <p>setAlignment (org.apache.poi.ss.usermodel.HorizontalAlignment) in CellStyle cannot be applied to (short)</p>
  </blockquote>
  
  <p>So it complains that it wants a <code>short</code> when I give it a <code>HorizontalAlignment</code> and that it wants a <code>HorizontalAligment</code> when I give it a <code>short</code>.</p>