Optionally have 'display-buffer' reuse windows of indirect buffers

Optionally have 'display-buffer' reuse windows of indirect buffers

* lisp/window.el (window-indirect-buffer-p): New function.
(get-buffer-window-list): New argument INDIRECT.
(display-buffer-reuse-window): New alist entry 'reuse-indirect'
to reuse a window indirectly related to the BUFFER argument.
* doc/lispref/windows.texi (Buffers and Windows): Describe new
function 'window-indirect-buffer-p' and new argument INDIRECT of
'get-buffer-window-list'.
(Buffer Display Action Functions): Describe new action alist
entry 'reuse-indirect'.
* etc/NEWS: Announce new argument for 'get-buffer-window-list' and
new 'display-buffer' action alist entry 'reuse-indirect'.

(cherry picked from commit a205d554522340e23540bdda63c80965ddd64951)