(est-eval-journal-volume): Use feature `date' instead of

(est-eval-journal-volume): Use feature `date' instead of
`published/date'.
(est-eval-value-as-object): Refer feature `=name'.
(est-eval-value-as-creators-names): Use `->creator/name' instead of
`->name'.
(est-eval-value-as-created-works): Use `<-creator' instead of
`->created'.