Modal form for ACL editing in the end-user app

[namedgraph]

There's no reason to go to the admin app in order to change authorizations for the current document.
If the agent has sufficient permissions (is the dataspace owner), having a modal form with acl:agentGroup x acl:mode and acl:agent x acl:mode matrixes. Changes to them would issue SPARQL updates for the admin SPARQL endpoint that would create/modify the authorizations.