* lisp/window.el (display-buffer-no-window): New action function.

* lisp/window.el (display-buffer-no-window): New action function.
(display-buffer-alist, display-buffer): Doc fix.  (Bug#13594)

* lisp/simple.el (shell-command): Add window alist entry `allow-no-window'
to `display-buffer'.
(async-shell-command): Doc fix.

* lisp/progmodes/compile.el (compilation-start): Rename window alist
entry `no-display-ok' to `allow-no-window'.

* doc/lispref/windows.texi (Choosing Window): Rename `no-display-ok' to
`allow-no-window'.