Closer.

File creation kind of works. Turns out the ptr struct member
in the table is the child pointer for directories, which I
should have realized. The translation from NIX to Inferno
keeps bollixing me up.

No more kernel panics, things seem to be right, but
mkdir #r/srv/x
cat #r/srv
shows x there, but 'ls '#r/srv' gets an error that x is not
there.

Signed-off-by: Ronald G. Minnich <rminnich@google.com>