Certify and Renew certification are now different

On a profile, there is a Certify button no matter if the a certification already exists. There could be:

• a "certify" button if the current identity did not certify the target identity
• a grayed "renew cert" button if a certification exists and was created recently
• a "renew cert" button if a certification exists and will expire soon

The act of certifying and renewing an existing certification are not the same and each have a specific extrinsic (add_cert() and renew_cert())

added ToDo priority:high labels

If the target identity has its membership close to expiration or already expired, it would be nice to add a warning to ask the certifier to reminds the target to renew his membership.

assigned to @zoltounet

removed ToDo label

added Doing label

mentioned in merge request !29 (merged)

mentioned in commit 257a97ba

closed with merge request !29 (merged)

changed milestone to %2.0.0-alpha45