Field/argument documentation inheritance

[hlship]

It would be very nice if the documentation attached to a field in an interface would become a default for the documentation of an object implementing that interface, if the object field does not provide its own documentation. Likewise for descriptions of arguments to that field, if any.

Basically, I would like to document my fields in the interfaces, and not have to recapitulate that documentation in the objects.

[hlship]

Closed by #105