code: def get_task_list(self):
          
          request = urllib.request.Request(self.url + '/rest/v1/tasks/all.json')
          if self.authorization_header() is not None:
              request.add_header('Authorization', self.authorization_header())
          request.add_header('User-Agent', 'GenePatternRest')
          response = urllib.request.urlopen(request)
          response_string = response.read().decode('utf-8')
          category_and_tasks = json.loads(response_string)
          raw_list = category_and_tasks['all_modules']
          task_list = []
          for task_dict in raw_list:
              task = GPTask(self, task_dict['lsid'], task_dict)
              task_list.append(task)
          return task_list
docs: Queries the GenePattern server and returns a list of GPTask objects,
          each representing one of the modules installed on the server. Useful
          for determining which are available on the server.