[RFC] Option to kill `emacs --daemon' when closing the last client frame

[Jim Porter]

I've been experimenting with using `emacs --daemon' and found one part 
of it to be somewhat surprising. If I set `ALTERNATE_EDITOR' to the 
empty string and run emacsclient, it runs `emacs --daemon' and connects 
to it; so far so good. But when I close the Emacs client, the Emacs 
daemon sticks around; I'd prefer the daemon to stop as well.

This would allow for a behavior similar to other (graphical) programs: 
if I run `firefox example.com', it starts a new instance as normal. If I 
run it again, it opens a new tab in the existing instance. If I close 
all the Firefox windows, all the associated processes terminate.

I didn't see any options to configure this behavior in Emacs, but 
looking over the code, it shouldn't be that hard for me to write a patch 
to add this as an option. Before I started though, I wanted to see what 
others thought. Is this a behavior others would be interested in? If so, 
are there any other particulars I should take into account in my patch?

- Jim