Fix license text and author.

Fix license text and author.
Move aliases (indent-for-comment, set-comment-column, kill-comment
and indent-new-comment-line) to the beginning of the file.
Get rid of the last few CLisms.
(comment-forward): Avoid decf.
(comment-make-extra-lines): Comment-out asserts.
(comment-with-narrowing): Properly create uninterned symbol.
(comment-region-internal): Comment-out asserts.  Avoid incf and decf.
(comment-indent-new-line): Fix bug where compt could be set but
not comstart.  Set comment-column more carefully.