[enh] #140: wot: Add choose_identity()

to choose identity among identities from wot/lookup
Display the uid, pubkey and the blockstamp to choose
Add tests on choose_identity()

Delete get_information_for_identity() based on top of the lookup

Allow to pass pubkey to the following commands:
The uid was the only identifier before
Adapt 'wot' and 'cert' commands to choose_identity()

Import silkaj.wot and click directly
Import directly bma otherwise there is a namespace conflict on 'wot'
on silkaj.wot and bma.wot