(Info-on-current-buffer): new entry point.
(Info-find-node): split into two for Info-on-current-buffer to hook into it. (Info-current-file, Info-set-mode-line, Info-up): Info-current-file can now be t. (Info-clone-buffer-hook): new function for `clone-buffer'. (Info-goto-node, Info-menu, Info-mode-map, Info-mode): make `clone-buffer' available in various ways to the user.
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