bug#50929: [External] : bug#50929: Add slurp-sexp and barf-sexp

[Drew Adams]

BTW, I'd point out, at least for Richard's benefit,
that slurp and barf have been around for years (and
with those names).  They were even around in the
mid 80s, for some "structured editors" (I don't
recall the command names used for them).  Some Emacs
packages have had them for a decade or so.

And if you search for those operation names you'll
likely see hits for auto-pairing packages, such as
smartparens and paredit.  Not an accident.

[Though I don't really care, and I'm no special fan
of the names "slurp" and "barf", I'd suggest that
using those same names might aid discoverability -
users from other editors (or even from GNU Emacs
packages) may look for those names.  Not a strong
reason to go with those names, but maybe something
to keep in mind.]