(comment-use-syntax): Change `maybe' to `undecided'.

(comment-use-syntax): Change `maybe' to `undecided'.
(comment-quote-nested): New.  Replaces comment-nested.
(comment-add): Turn into a mere defvar or a integer.
(comment-style): Change default to `plain'.
(comment-styles): Rename `plain' to `indent' and create a new plainer `plain'.
(comment-string-reverse): Use nreverse.
(comment-normalize-vars): Change `maybe' to `undecided', add comments.
  Don't infer the setting of comment-nested anymore (the default for
  comment-quote-nested is safe).  Use comment-quote-nested.
(comment-end-quote-re): Use comment-quote-nested.
(comment-search-forward): Obey LIMIT.
(comment-indent): Don't skip forward further past comment-search-forward.
(comment-padleft): Use comment-quote-nested.
(comment-make-extra-lines): Use `cons' rather than `values'.
(comment-region-internal): New arg INDENT.  Use line-end-position.
  Avoid multiple-value-setq.
(comment-region): Follow the new comment-add semantics.
  Don't do box comments any more.
(comment-box): New function.
(comment-dwim): Only do the region stuff is transient-mark-active.