Zetalisp to Common Lisp conversion routines

[Barry Margolin <barmar%vermithrax.sch.symbolics.com@RELAY.CS.NET>]

Well, we did all of our ZL->CL conversion around the time we upgraded
from 6.1 to 7.0, so Symbolics's tools weren't used.  However, I tried to
use them myself on a few occasions.  The only problem I had was that
they made some assumptions about packages.  Most of our local hacks are
in various Symbolics packages, rather than in application-specific
packages (yes, I know this is a bad idea, but that's the way it was when
I got here); for instance, our Zmacs extensions are in the ZWEI package.
The conversion tools require you to select a new package, but then they
don't add in the necessary ZWEI: prefixes.  Similarly, it didn't seem to
be easy to convert things that were in the ZL-USER package into the
CL-USER package.