v0.6.7: asking again goes back to a person

• When an agent asks again for something a person rejected, it now goes back to a person, flagged with their earlier "no" and note, instead of being refused with no way to say yes. Set repeat_of_rejected: block in rules.yaml for the old behaviour. An unedited rules.yaml updates on the next start.
• When nobody approves in time, the agent is told exactly that (and where to approve), not that a rule blocked it.