def manifest_header(type_name, version='<STR_LIT:1.0>'):
return "<STR_LIT>".format(<EOL>type_name.title(),<EOL>version,<EOL>)<EOL>
Returns a header, suitable for use in a manifest.

    >>> manifest_header("signature")
    "Signature-Version: 1.0"

    :param type_name: The kind of manifest which needs a header:
        "manifest", "signature".
    :param version: The manifest version to encode in the header
        (default: '1.0')