(ibuffer-columnize-and-insert-list, ibuffer-mouse-toggle-mark,

(ibuffer-columnize-and-insert-list, ibuffer-mouse-toggle-mark,
ibuffer-count-marked-lines, ibuffer-unmark-all, ibuffer-toggle-marks,
ibuffer-unmark-forward, ibuffer-unmark-backward,
ibuffer-compile-make-format-form, ibuffer-format-column,
ibuffer-current-buffers-with-marks, ibuffer-update-title-and-summary):
"?\ " -> "?\s".
(ibuffer): Doc fix.
(ibuffer-mode): Fix typo in docstring.
(ibuffer-hooks, ibuffer-mode-hooks): Make obsolete and declare with
`define-obsolete-variable-alias'.
(ibuffer-elide-long-columns): Mark as obsolete.  Doc fix.