ninpaths updated

[Olaf Titz]

> Well... hm.  I liked the MODE CANCEL idea because we could add additional
> commands down the road to negotiate things like what cancel streams one
> wants, or exchange authentication for the streams, or something.  Plus it
> gives the server a clear place to say "sorry, I don't support that."

OK, but not with the current implementation (separate fundamental state).
Then it needs to be hooked up in a way similar to the MODE STREAM stuff.

Presumably this isn't really difficult, it's just a different way to
implement it.

Olaf