docs: def load(self, filename):
          ''' Load the given config file.
  
              @param filename: the filename including the path to load.
          '''
          if not os.path.exists(filename):
              #print 'Could not load config file [%s]' % (filename)
              raise AppConfigValueException('Could not load config file {0}'.
                      format(filename))
          cfl = open(filename, 'r')
          if PY2:
              self.readfp(cfl)
          else:
              self.read_file(cfl)
          cfl.close()