Assign new genres `journal-name@ruimoku', `publisher@ruimoku' and

Assign new genres `journal-name@ruimoku', `publisher@ruimoku' and
`publisher-name@ruimoku'.
(www-feature-value-format): Use `space-separated' instead of
`space-separated-char-list' for type `relation'; use `space-separated'
as the default format.
(est-format-object): Add new optional argument `readable'; if the
optional argument `readable' is not nil, use feature-value of `name',
`=name' or `title' as object representation format.