allow relation fields in __title__

[namlook]

___title__: {template: "{{relation.title}} {{otherField}}"}

and

__title__: {bindTo: "relation.title"}}

Question: what about search and speed ?

[namlook]

The solution:

__title__: {template: "{{relation.content.title}} {{otherField}}"}

using descriptors are allowed:

__title__: {{template: "{{relation.__title__}} {{otherField}}"}