Make FCP call and reply names homogeneous:
- "GetAllIdentities" has a filter for filtering by context => Rename it to "GetIdentities". Therefore also rename GetAllScores/GetAllTrusts to GetScores/GetTrusts
- Get(All)Identities replies with "Message"="Identities" but the trust/score getter replies with Message=TrustValues/ScoreValues. Rename the Message to Trusts/Scores.
- Notice that those functions are not present in master yet so we don't need backwards compatibility.