title: formatNumber : how to add 2 decimal digits at the back of numbers?
body: <p>I am using grails formatNumber and I would like to display my numbers in decimal format.</p>
  
  <p>I would like to display 10 as 10.00 
  or 0 as 0.00 with 2 decimal digits.</p>
  
  <p>how to do that ? </p>