(ideographic-radical): New function.

(ideographic-radical): New function.
(shuowen-radicals): New constant.
(shuowen-radical): New function.
(char-db-insert-char-reference): Use function `ideographic-radical'
to avoid to refer `ideographic-radicals'.
(insert-char-attributes): Likewise; add code to format char-feature
`shuowen-radical'.
(insert-char-attributes): Don't display `->formed' when running with
non-readable mode.