(sgml-value): Use 'identity as default value.

(sgml-value): Use 'identity as default value.
(sgml-mode): Doc fix.
(sgml-name-8bit-mode): Tell the user if set or reset.
(sgml-tag): Doc fix.
(sgml-tag): Protect "<" from skeleton-transformation.
(sgml-attributes): Doc fix.
(sgml-attributes): Square brackets removed from prompt.
(sgml-attributes): Arg ALIST renamed to TAG.
(sgml-attributes): Apply skeleton-transformation when necessary.
(sgml-value): Doc added.
(sgml-value): Square brackets removed from prompt.
(html-tag-alist): New variable 1-7, variable `list' changed.
(html-tag-alist)<dir>, <menu>: Use new value of `list'.
(html-tag-alist)<font>: Fixed (doc of sgml-tag-alist needs fixing).
(html-tag-alist)<ol>, <ul>: Fixed.
(html-tag-alist)<fn>: Commented out.