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modes.
(msb--init-file-alist, msb--aggregate-alist, msb--add-separators):
Fix previous change to mapcan.
(msb--init-file-alist, msb--add-separators)
(msb--make-keymap-menu): Simplify.
(msb--choose-file-menu): Use copy-sequence.
(msb-mode-map): Add title to keymap.
(msb-unload-hook): New function.