This was pretty much a prerequisite for introducing macros (in commits to
follow)---the code would otherwise be far too verbose.
Note that this does _not_ introduce the shorthand forms ("'", "`", ",",
",@"), as implementing those in a reasonable manner would require
preprocesing the AST, which is not what I want to focus on right now. So
macros will still be a bit verbose, using the full
"(quasiquote ... (unquote-splicing ...))" and such instead of simply
"`(... ,@(...))"
* build-aux/bootstrap/rebirth.scm
(quote-sexp, quasiquote-sexp): Add procedures.
(fnmap)[quote]: Use `quote-sexp'.
[quasiquote]: Add special form.