[CM] fixes fixes fixes

[Fernando Pablo Lopez-Lezcano]

> Ive made lots of fixes to both the book and the sources. cm-2.4.0 
> w/chapter material from ch. 9-22 has been tested in the following 
> lisp's:

cm::set-cm-host-dir is no longer there. What has it been replaced with?
(the source at run time is going to be in a different place than at
compile time and I need to take that into account). 

-- Fernando