model: CRUD methods only for targeted objects

A create, read, update or delete (CRUD) method should only care about
the object which provides the receiver and the relations to its child
objects.

For example the method

	func (r *Recipe) Create(tx *sql.Tx) error {}

should only create the relational data inside the database for the
recipe, not for the steps nested into this Recipe struct. This should be
covered by the

	func (s *Step) Create(tx *sql.Tx) error {}

method which is then called by `func (r *Recipe) Create()`.

This has the advantage that every CRUD method has a constraint scope and
is more unified since the Step CRUD methods now have a Step struct as
receiver instead of a Recipe receiver.

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