Don't require cl.

Don't require cl.
(crisp-override-meta-x): Doc fix.
(crisp-last-last-command): Doc fix.
(mark-something): Function deleted.
(crisp-mark-line): Avoid using mark-something.
(crisp-region-active): Renamed from region-active.
(crisp-set-clipboard): Renamed from copy-primary-selection.
(crisp-kill-region): Renamed from kill-primary-selection.
(crisp-yank-clipboard): Renamed from yank-clipboard-selection.