More console changes

[Chris Faylor]

I've implemented the method for sharing the console attributes among
processes.  That means that you should now be able to say things like
'stty -echo' in a shell and have it actually work.

Please try this out.  I'm trying to close out some open issues so that
we can get a B21 out.  The biggest patch coming that hasn't been committed
is Corinna's security patch.  I hope that we can have that in within a
week, assuming that it is working ok?

Has anyone tried Corinna's patch?

-chris