def download_url_list(url_list, outdir):
for url in url_list:<EOL><INDENT>download_url_single(url, outdir)<EOL><DEDENT>
Downloads list of http(s) urls to local files
:param list url_list: list of URLs to download
:param str outdir: Required. the local directory to put the downloadedfiles.
  If this is not given, then the local file will be the original one, as given in url.
:return None