title: Making new colors in JExcelApi
body: <p>I'm using JExcelApi for generating XLS files.  From <a href="http://jexcelapi.sourceforge.net/resources/javadocs/2_6_10/docs/jxl/format/Colour.html" rel="noreferrer">jxl.format.Colour</a>, I see how to get any of the colors in the "standard Excel colour palette", but not how to create a new color (say, given its RGB).</p>
  
  <p>But in Excel itself, I can pick any color at all.</p>
  
  <p>Am I just missing it?  Is there a way in JExcelApi to select an arbitrary color?  I'm using a simple find-the-closest-standard-color method right now, which is OK but not great.</p>