Have 'split-window' optionally resurrect deleted windows

Have 'split-window' optionally resurrect deleted windows

* src/window.c (Fwindow_old_buffer): Handle deleted window as
argument.
(make_parent_window): Remove function.
(Fsplit_window_internal): New argument REFER for resurrecting
deleted windows.  Incorporate functionality of defunct
make_parent_window.
(Fdelete_window_internal, delete_all_child_windows): Store any
deleted window's buffer in the window's old_buffer slot.
(window_dead_windows_table): Make it a 'value' type hash table
so the sequence number cannot affect its weakness.
* lisp/window.el (split-window): New argument REFER.
* doc/lispref/windows.texi (Resurrecting Windows): New section.
(Splitting Windows): Explain new argument REFER.
(Window Hooks): Rewrite description of 'window-old-buffer'.
* etc/NEWS: Mention new REFER argument for 'split-window'.

(cherry picked from commit 7f286e7d83665526929dea3f7180f3a5ba8ef14e)