Add zglob, zglobcmd.
Remove first-and-only, current-directory functions (use xcvb-driver instead).

Don't use the limited SBCL backend by default, for now. Requires more work.

Put back the dependency on fare-mop (we use its SIMPLE-PRINT-OBJECT-MIXIN, as reported by Nathan Hawkins <utsl@quic.net>).
Also, add a trivial test suite to prevent such breakage from happening again.