[PATCH] add-shell, remove-shell: new applets

[Matthew Stoltenberg]

> Why do you need it? (I ask because sometimes there _is_ a valid,
> but unknown to me, reason to have this or that tool in bbox).

I will vouch that a lot of debian based systems seem to break if you
don't have /etc/shells setup correctly.  Several releases of
MontaVista exhibit this behaviour.

A more useful option may be to have an optional /etc/shells file that
a busybox install sets up with the currently included shells.  Just my
2 cents.

Matt