title: Disable highcharts tooltip on certain lines, leave it enabled on others?
body: <p>I have a Highchart containing multiple lines.  I want to disable the tooltip on certain lines, and leave it enabled for others.  Is that possible?  I see how to disable the tooltip globally, but not by series.</p>
  
  <p>For instance, on the <a href="http://jsfiddle.net/gh/get/jquery/1.7.2/highslide-software/highcharts.com/tree/master/samples/highcharts/demo/line-basic/" rel="noreferrer" title="this example">standard line chart example</a> is it possible to disable the tooltip on the red and blue lines but leave it enabled on the other two?</p>