Peru Rebel Chief Scores Publicity Coup in Court &lt;p&gt;&lt;/p&gt;&lt;p&gt; By Jude Webber&lt;/p&gt;&lt;p&gt; CALLAO NAVAL BASE, Peru (Reuters) - Punching the air with afist and chanting rebel slogans, Peru's Shining Path founderAbimael Guzman scored a propaganda coup on Friday and forcedhis terrorism retrial to be postponed for a week.&lt;/p&gt;