GET /controller -> controller::_index()
POST /controller -> controller::_create()
GET /controller/id -> controller::_show()
PUT /controller/id -> controller::_update()
DELETE /controller/id -> controller::_delete()
GET /form/edit/controller/resource_id -> controller::_form()
GET /form/add/controller/data -> controller::_form()
associates them with the form. This replaces the various _add_validation_rules()
functions in the user and comment modules.
Move user edit form into user helper for consistency with the comment module.
Implement missing _form method in the user controller.