add a suffix to the name of inferior lisp buffers

In the current state, SLIME names all inferior lisp buffers `*inferior-lisp*`
by default. When starting multiple implementations, we end up with multiple
inferior lisp buffers whose only difference is a non-descriptive number
suffix.

With this patch, we use the name of the implementation as suffix, in a way
similar to REPL buffers.

For example with two inferior lisps SBCL and CCL, we now have `*inferior-lisp
sbcl*` and `*inferior-lisp ccl*`

slime.el

@@ -1065,7 +1065,9 @@ The rules for selecting the arguments are rather complicated:
                             (coding-system slime-net-coding-system)
                             (init 'slime-init-command)
                             name
-                            (buffer "*inferior-lisp*")
+                            (buffer (concat "*inferior-lisp "
+                                            (file-name-nondirectory program)
+                                            "*"))
                             init-function
                             env)
   "Start a Lisp process and connect to it.