Allow non-default values of `bs-header-lines-length'.
(bs--running-in-xemacs): Remove (not used anymore). (bs--set-window-height): Simplify by using `fit-window-to-buffer' instead of `shrink-window', thus avoiding having to compute the height of the window. (bs--up): Wrap around even when there's no header. (bs--down): Use `forward-line' instead of `next-line'.
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