Rename split-window-{above-each-other|split-window-side-by-side}

Rename split-window-{above-each-other|split-window-side-by-side}
to split-window-below and split-window-right.

* lisp/window.el (split-window-below, split-window-right): Rename from
split-window-above-each-other and split-window-side-by-side
respectively.  All callers changed.
(split-window-sensibly, split-window-sensibly): Use them.
(split-window-keep-point): Doc fix.

* lisp/isearch.el: Add isearch-scroll property to split-window-below
and split-window-right.

* lisp/follow.el (follow-mode):
* lisp/vc/pcvs-util.el (cvs-pop-to-buffer-same-frame):
* lisp/progmodes/ada-xref.el (ada-gdb-application):
* lisp/emulation/vip.el (vip-buffer-in-two-windows):
* lisp/image-dired.el (image-dired-dired-with-window-configuration):
* lisp/dired-x.el (dired-do-find-marked-files):
* lisp/dired.el (dired-pop-to-buffer):
* lisp/bs.el (bs--show-with-configuration):
* lisp/vc/emerge.el (emerge-setup-windows):
* lisp/textmodes/two-column.el (2C-two-columns):
* lisp/textmodes/reftex-toc.el (reftex-toc):
* lisp/progmodes/gdb-mi.el (gdb-setup-windows):
* lisp/progmodes/fortran.el (fortran-window-create):
* lisp/net/newst-treeview.el (newsticker--treeview-window-init):
* lisp/emulation/ws-mode.el (wordstar-C-o-map, wordstar-mode):
* lisp/emulation/tpu-edt.el (tpu-gold-map):
* lisp/emulation/crisp.el (crisp-mode-map):
* lisp/calendar/calendar.el (calendar-basic-setup): Callers changed.