title: Format a decimal using at least 2 places and at most 6 places
body: <p>To meet a specification I need to format a decimal value with the rule:  </p>
  
  <ul>
  <li><em>All values must have at least two decimal places and at most six</em>.</li>
  </ul>
  
  <p>Example: </p>
  
  <pre><code>Value        Formatted
  1            1.00
  1.1          1.10
  1.1234       1.1234
  1.123456     1.123456
  1.12345678   1.123456
  </code></pre>
  
  <p>I guess I'll end using a condition, but I wonder if there is a format string which can do this.</p>