I'd like to be able to easily choose between several lisp
implementations when starting slime (sbcl, cmucl, clisp). The
most recent message I was able to find, on
http://article.gmane.org/gmane.lisp.slime.devel/3932
suggested using slime-register-lisp-implementation, but I see
that this function has been deleted. What's the current 'right'
way to do this?