[Openid-specs-fapi] Issue #489: Align FAPI-CIBA to FAPI2-baseline/advanced (openid/fapi)

[josephheenan]

New issue 489: Align FAPI-CIBA to FAPI2-baseline/advanced
https://bitbucket.org/openid/fapi/issues/489/align-fapi-ciba-to-fapi2-baseline-advanced

Joseph Heenan:

Should we somehow align FAPI-CIBA to FAPI2?

Currently FAPI-CIBA requires signed request objects in the backchannel; if it was being used in a FAPI2-baseline ecosystem it would make sense to use unsigned requests.