Colombian Indians Want Time to Forget Their Land &lt;p&gt;&lt;/p&gt;&lt;p&gt; By Jason Webb&lt;/p&gt;&lt;p&gt; SABANA CRESPO, Colombia (Reuters) - Coca leaves, the rawmaterial of cocaine, should speed you up and give you a buzz.But you'd never know it to look at the Arhuaco Indians ofColombia's Sierra Nevada, who must be strong contenders for thetitle of World's Most Laid-Back People.&lt;/p&gt;