Handle window-height and window-width alist entries in `display-buffer'.

Handle window-height and window-width alist entries in `display-buffer'.

In buffer display functions handle window-height/window-width
alist entries.  Suggested by Juri Linkov as fix for Bug#1806.
* window.el (window--display-buffer): New argument ALIST.  Obey
window-height and window-width alist entries.
(window--try-to-split-window): New argument ALIST.  Bind
window-combination-limit to t when the window's size shall be
changed and window-combination-limit equals `window-size'.
(display-buffer-in-atom-window)
(display-buffer-in-major-side-window)
(display-buffer-in-side-window, display-buffer-same-window)
(display-buffer-reuse-window, display-buffer-pop-up-frame)
(display-buffer-pop-up-window, display-buffer-below-selected)
(display-buffer-at-bottom, display-buffer-in-previous-window)
(display-buffer-use-some-window): Adjust all callers of
window--display-buffer and window--try-to-split-window.
(fit-frame-to-buffer): New option.
(fit-window-to-buffer): Can resize frames if fit-frame-to-buffer
is non-nil.
(display-buffer-in-major-side-window): Evaluate window-height /
window-width alist entries.

* help.el (temp-buffer-resize-frames)
(temp-buffer-resize-regexps): Remove options.
(temp-buffer-resize-mode): Adjust doc-string.
(resize-temp-buffer-window): Don't consult
temp-buffer-resize-regexps.  Use fit-frame-to-buffer instead of
temp-buffer-resize-frames.

* dired.el (dired-mark-pop-up): Call
display-buffer-below-selected with a fit-window-to-buffer alist
entry.

* window.c (Vwindow_combination_limit): New default value.
(Qwindow_size): New symbol replacing Qtemp_buffer_resize.