ACL port status



Just a quick note on the ACL port.  Everything seems to basically
work.  You can configure with acl6, make it the default lisp, etc.
describe works, plotting works.

However, it fails several of the tests, gets error checks in several
more tests, and goes into an infinite loop on one errcatch.  Also, you
can't split the input across lines.  For some reason ACL continues to
read and return NIL instead of waiting for more input.

I'll work on this a bit more and fix what I can, but I'd like to check
these changes in within the next few days.

Ray