(chise-turtle-uri-encode-feature-name): Use "rdfs:comment" for

(chise-turtle-uri-encode-feature-name): Use "rdfs:comment" for
`*note'.
(concord-turtle-insert-feature-value): Insert main value before
metadata.
(concord-turtle-insert-char-ref): Modify spaces between `rdf:value'
and value.
(concord-turtle-insert-object-features): Likewise; use `rdfs:label'
instead of `:unofficial-name'; modify other spaces.
(concord-turtle-insert-prefix): Add "rdfs:" for the prefix for
<http://www.w3.org/2000/01/rdf-schema#>.