bug#47075: [FEATURE REQUEST] kill-buffer: option to prompt to save

[Boruch Baum]

Evaluating function `kill-buffer' for a modified file buffer leads to a
prompt "foo modified, kill anyway (y or n)". Thus, for the common case
of a user wanting to save and kill a modified buffer, the user must at
this point perform three operations: respond no to the prompt, save the
file, perform the kill-buffer operation a second time.

It would be more convenient for the prompt to offer an option to 'save
and kill' the buffer, so that no extra steps be required.

I had wanted to offer a patch for this, but I couldn't find the elisp
function that was directly causing the prompt. My guess is that it is
directly called by the C source code for function kill-buffer, but I
don't have the C source code available. If so, the idea would likely be to
replace a call to y-or-n-p with a read-char loop, checking for (y Y n N
s S).

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