cubicweb #1894929 `use_email` relation type cannot be modified [resolved]

Relation types cannot be inherited by design and we have raw permission declaration in the use_email class.

So, this is not possible to modify other use_email relations as the one found in the cube Person.

We must be more precise by replacing the relation type by an explicit definition for relation "CWUser" use_email "EmailAddress"

done in3.13.4
load left0.000
closed by#432e1f0d4857 [schema] use definition for `use_email` relation instead of type declaration (closes: #1894929)