Keys in edit-abbrevs-mode

[Leo]

Hi all,

I wonder if we can change the key bindings in edit-abbrevs-mode to be
more in line with global bindings.

C-x C-s  --  redefine and save to the default abbrev file
C-x C-w  --  redefine and asked the user which file to save

It is a bit odd after C-x C-s in that edit-abbrevs buffer, users are
still asked whether to save their abbrevs when exiting Emacs.

Any comments?

Leo