Add SML-mode.
* sml-mode.el: Integrate BUGS&NEWS; re-add run-sml.
* packages/sml-mode/sml-mode.el (sml-mode-map): Add back C-c C-s binding.
(sml-prog-proc-switch-to): Add missing interactive spec.
* sml-mode.el (inferior-sml-mode): Fix comint-completion-addsuffix.
* sml-mode.el (sml-mode-variables): Set sml-prog-proc-descriptor here...
(sml-mode): ... instead of here.
* sml-mode: Release 6.3, bugfixes
* packages/sml-mode/sml-mode.el (sml-imenu-regexp): Make it a const.
(sml-imenu-create-index): Don't assume we'll find an = after structure.