bug#50929: Add slurp-sexp and barf-sexp

[Richard Stallman]

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  > > I use C-<left> and C-<right>, but alternatives I can think of are
  > > M-<left> and M-<right>, C-< and C-> or M-[ and M-].

You can bind these keys yourself if they work ok on your terminal, but
they can't be the standard bindings.  C-< and C-> are not ASCII.
M-<left> moves by words; M-[ not possible on ttys.  C-<left> seems to be the
same as <left> on this tty.

                                                           The former two
  > > combinations are both bound to left- and right-word, and the latter two
  > > combination is unbound in emacs-lisp-mode.

  > How about us, people without the arrow keys? :) BTW, I find C-()
  > and C-{} used by Paredit fairly usable.

If `C-()' means C-( and C-), they are not in ASCII.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)