Only supported when XML::CanonicalizeXML is used as the canonicalizer module.
SAML metadata need not contain 64-char wrapped base64 data, so we must rewrap before sticking PEM-style headers on it and feeding the result to OpenSSL.
Also PAUSE-hide our testapp package. Bump version to 0.12.
Breaks things for non-author builds.
See https://github.com/chrisa/perl-XML-Sig for change history.
Things that aren't just bare strings but do stringify confuse rawdeflate - do the stringify for it.