confirmation for change in pod parameters

[bourgeoa]

To avoid change of control some changes shall be closely supervised :

• user email
• IdP provider
• owner
• external webId

Among possibilities are :

• ask confirmation by email : email is not a MUST actually
• have a secure resource box where to check for new values where only owner has access
  actually NSS uses .meta,
  inconvenient it is discoverable in container representation, but all values are actually public)