Fix construction of stand-alone public keys #2
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The PublicKey "from" implementations didn't reverse the "encode"
operation from PublicKey::as_byte, and so a stand-alone PublicKey could
not be correctly constructed from bytes. (PublicKeys constructed from
PrivateKeys were fine.)
With this change the RFC8032 test-vectors in rfc8032.rs all pass even
when verifying the signatures using a PublicKey constructed from bytes.
A couple of unit-tests needed updating as not all 57-byte octet
sequences are valid Ed448 public keys (which is correct).
With this change an (unpublished) rust TLS client library can now successfully
connect to a GnuTLS server using ed448-rust signatures for certificates and ECDHE
parameters.