(recentf-menu-open-all-flag): New option.

(recentf-menu-open-all-flag): New option.
(recentf-digit-shortcut-command-name): New function.
(recentf--shortcuts-keymap): New variable.
(recentf-menu-shortcuts): New variable.
(recentf-make-menu-items): Initialize it.  Replace the "More..."
menu item by "All...", if `recentf-menu-open-all-flag' is non-nil.
(recentf-menu-value-shortcut): New function.
(recentf-make-menu-item): Use it.  No more in-lined.
(recentf-dialog-mode-map): Base on `recentf--shortcuts-keymap'.
(recentf-open-most-recent-file): Rename from
`recentf-open-file-with-key'.  Don't depend on key binding.
(recentf-mode-map): New variable.
(recentf-mode): Use it.