Before that it was necessary to install a function in the lisp environment
either in the source itself in src/utils/transforms.lisp, or in a lisp file
loaded with --load-lisp-file (or -l for shorts).
While this could be good enough, sometimes a very simple combination of
existing features is required to transform a function and so doing some
level of lisp coding directly in the load command is a nice to have.
Fixes#961.
