public static function run($dataDir = null)
 {
     # Instantiate project object
     $project = new Project();
     print $project->getCalculationMode();
     $task = $project->getRootTask()->getChildren()->add("Task");
     $tsk = new Tsk();
     $task->set($tsk->DURATION, $project->getDuration(2));
     $task->set($tsk->PERCENT_COMPLETE, 50);
     print "Changed progress of task." . PHP_EOL;
 }