Great big batch-o-fixes.

jkh:
Change the fixit floppy paradigm somewhat. Rather than having
a fixit floppy be a stand-alone boot floppy with emasculated
command set due to space crunch, make boot floppy a filesystem
of nice utilities and *no* kernel. The idea is that you boot
the standard boot floppy and choose the "Fixit" item off the top
menu. It then asks for and mounts the fixit floppy, adds the mount
point to $PATH and then forks a shell with the inherited PATH. You
can use the shell to traipse around the filesystem, tweaking things
as desired.

Mutate the useless shell option in first menu to far more useful fixit.

Fix the bogus `ifconfig sl0' case once and for all with a special case
hack for cuaa0.

gpalmer:
Fix benign-yet-bogus incorrect `password' to anon ftp sites.

joerg:
Allow cpio to guess at input format again.
Submitted by: jkh, gpalmer, joerg