dbus methods: listIdentity, trust

[johnfreed]

Implement new Dbus methods:

• listIdentity(number<s>)
• trust(number<s>, safetyNumber<s>)

Update documentation

[johnfreed]

I took another approach to this one to more closely mirror the listIdentities command, and so I used that name.

Calling with an argument (a single contact) returns a dictionary just for that contact, with the contact number as key and the four data points as values.

Calling without an argument returns an array of dictionaries of all relevant contacts with the four data points. (Perhaps that should be instead a single dictionary with multiple keys?)

[johnfreed]

I think I'll resubmit it as a single dictionary with multiple keys.

[bublath]

Any chance that this gets continued? A dbus interface to restore trust is the top requirement my users would still have, as they currently have to do this from commandline, instead of using my User Interface.

[AsamK]

Superseded by #1259