(est-eval-value-as-journal-volume): Renamed from

(est-eval-value-as-journal-volume): Renamed from
`est-eval-journal-volume'.
(est-eval-value-as-article): New function.
(est-eval-value-as-book): New function.
(est-eval-value-as-object):
- Use `est-eval-value-as-journal-volume' instead of
  `est-eval-journal-volume'.
- Use function `est-eval-value-as-article' for genre
  `article@ruimoku'.
- Use function `est-eval-value-as-book' for genre `book@ruimoku'.
(est-eval-value-as-object-list):
- Add new optional argument `subtype'; set it into property :subtype.
- Fix problem when `value' is not a valid list.
(est-eval-value-as-creators-names): Add new optional argument
`subtype'; set it into property :subtype.
(est-eval-value-as-created-works): Likewise.
(est-eval-apply-value): Add new formats `unordered-list',
`unordered-creator-name-list' and `unordered-created-work-list'.