Use `id_from_pubkeys()` in `blocks` and `net` commands

Use id_from_pubkeys() in blocks and net commands.

This function will most likely become useless when migrating to GVA usage.

changed milestone to %0.8.0

added enhancement label

mentioned in issue #192

mentioned in issue #222

changed milestone to %0.9.0

marked this issue as related to #222

added Easy pick Web of Trust labels

changed the description

changed milestone to %0.11.0

changed milestone to %0.10.0

id_from_pubkeys() will most likely become useless because of GVA.

changed milestone to %Backlog

added TBR label

added To Do label

removed To Do label