implement 1.9.11 api changes - getLastExecutionResult

[lczub]

with future TL release 1.9.11 api method getLastExecutionResult() returns also the linked bug ids (see http://mantis.testlink.org/view.php?id=6444)

   * @param int $args["options"] - optional 
   *                               options['getBugs'] = true / false
   *
   * @return mixed $resultInfo
   *               if execution found
   *               array that contains a map with these keys:
   *               id (execution id),build_id,tester_id,execution_ts,
   *               status,testplan_id,tcversion_id,tcversion_number,
   *               execution_type,notes.
   *
   *               If user has requested getbugs, then a key bugs (that is an array)
   *               will also exists.