Minor changes to the setup

As a followup to my initial getting started post:

* I later replaced the Clozure App with the command-line version, obtained by

`svn co http://svn.clozure.com/publicsvn/openmcl/release/1.9/darwinx86/ccl`

• The basic slime (running in comint mode) is a bit too bare-bones, and it’s much better to add

`(setq slime-contribs ‘(slime-fancy))`