[CM] clm under cmucl-18e

[Bill Schottstaedt]

 > 1. It calls (load-foreign ...).  Needs to be (ext:load-foreign ...)

Hmm -- something is odd about this, since it (cmucl 18e) works
fine for me, but in any case I added it to the import list:

   #+cmu (:import-from "EXTENSIONS" "QUIT" "LOAD-FOREIGN")

 > 2. Various instrument files don't have (in-package :clm) at the top.

None of them need it, and in fact are probably better off
without it.

 > 3. (with-sound ...) failed when lisp invoked a shell command "sndplay <file>".
 > I fixed it by setting *clm-player* explicitly.  I guess I could/should change my search
 > path.  (I didn't see any instructions saying I needed to do that.)

I included the full pathname at one time, and that caused
endless trouble; I'll add a note about this to README.clm.