Change modes that used same-window-* vars to use switch-to-buffer.

Change modes that used same-window-* vars to use switch-to-buffer.

* cmuscheme.el (run-scheme, switch-to-scheme):
* ielm.el (ielm):
* shell.el (shell):
* net/rlogin.el (rlogin):
* net/telnet.el (telnet, rsh):
* progmodes/inf-lisp.el (inferior-lisp): Use switch-to-buffer.

* cus-edit.el (customize-group, custom-buffer-create)
(customize-browse, custom-buffer-create-other-window): Use
switch-to-buffer or switch-to-buffer-other-window.

* info.el (info, Info-find-node, Info-revert-find-node, Info-next)
(Info-prev, Info-up, Info-speedbar-goto-node)
(info-display-manual): Use switch-to-buffer.
(Info-speedbar-goto-node): Use switch-to-buffer-other-frame.

* lisp/gnus/message.el (message-pop-to-buffer): Default to switch-to-buffer.
(message-mail-other-window, message-mail-other-frame)
(message-news-other-window, message-news-other-frame): Use
switch-to-buffer-other-frame and switch-to-buffer-other-window instead
of setting buffer display varibles.

* mail/sendmail.el (mail): Use switch-to-buffer.
(mail-recover): Use switch-to-buffer-other-window.

* progmodes/gdb-mi.el (gdb-restore-windows, gdb-setup-windows):
Use switch-to-buffer.