code: def make_user_readable (directory):
      
      for root, dirs, files in os.walk(directory, onerror=util.log_error):
          for filename in files:
              make_file_readable(os.path.join(root, filename))
          for dirname in dirs:
              make_dir_readable(os.path.join(root, dirname))
docs: Make all files in given directory user readable. Also recurse into
      subdirectories.