translate-logical-pathnames & logical hosts

[David Kieras <kieras@engin.umich.edu>]

After spending a lot of time on these supposedly standard facilities,
setting up my MCL versions of code using them, I have discovered
that the current Franz Allegro CL for my new, very fast, HP, does
not yet have them.  So much for portable standard facilities
for making it easy to move code between platforms.  Proceed with
caution!