code-block languages may specify their own headers and values

code-block languages may specify their own headers and values

* lisp/ob-R.el (org-babel-header-args:R): Adding values.
* lisp/ob-clojure.el (org-babel-header-args:clojure): Adding values.
* lisp/ob-lisp.el (org-babel-header-args:lisp): Adding values.
* lisp/ob-sql.el (org-babel-header-args:sql): Adding values.
* lisp/ob-sqlite.el (org-babel-header-args:sqlite): Adding values.
* lisp/ob.el (org-babel-combine-header-arg-lists): Combine lists of
  arguments and values.
  (org-babel-insert-header-arg): Use new combined header argument
  lists.
  (org-babel-header-arg-expand): Add support for completing-read
  insertion of header arguments after ":"
  (org-babel-enter-header-arg-w-completion): Completing read insertion
  of header arguments
  (org-tab-first-hook): Adding header argument completion.
  (org-babel-params-from-properties): Combining header argument lists.
* testing/lisp/test-ob.el (ob-test/org-babel-combine-header-arg-lists):
  Test the new header argument combination functionality.