docs: def write_settings(settings):
      '''
      Saves user's settings
      @returns True on success
      @returns False on failure
      '''
      if not os.access(DATA_DIR, os.W_OK): return False
      try:
          f = open(DATA_DIR + os.sep + SETTINGS_FILE, 'w')
          f.writelines(json.dumps(settings, indent=0))
          f.close()
          os.chmod(os.path.abspath(DATA_DIR + os.sep + SETTINGS_FILE), 0o777) # to avoid (or create?) IO problems with multiple users
      except IOError:
          return False
      else:
          return True