X-Debbugs-Cc: rudalics@gmx.at

For a long time, I've had a bit of code in my config to invert the 
default behavior of 'quit-window', so that it normally kills the buffer, 
but buries it with the prefix arg. With bug#76248, I now have almost 
what I want in Emacs proper (thanks!), except without the prefix arg 
behavior.

Attached is a patch to do this. Hopefully the documentation is ok, but 
I'm open to other wordings. I fear my current wording might be a bit 
convoluted...