Restore follow-scroll-up/down to scrolling by the combined size of all windows
Also rename the current follow-scroll-up/down functions to follow-scroll-up-window and follow-scroll-down-window. These scroll by the height of the current window. This fixes bug #23347. * lisp/follow.el (follow-mode): Tweak the doc string. (follow-scroll-up-arg, follow-scroll-down-arg): new functions, extracted from follow-scroll-up/down. (follow-scroll-up-window, follow-scroll-down-window): Functions renamed from follow-scroll-up/down. (follow-scroll-up, follow-scroll-down): Restore the historic functionality.
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