Standardize/fix some Org header comments.

Standardize/fix some Org header comments.

* org-freemind.el: Remove duplicate, incorrect license notice.

* ob-lisp.el: Convert consecutive copyright years to ranges.

* ob-js.el, ob-scheme.el: Standardize license text.

* ob-R.el, ob-clojure.el, ob-exp.el, ob-lisp.el, ob-lob.el, ob-perl.el:
* ob-python.el, ob-ref.el, ob.el:
Put multiple authors on separate lines.