[Vorbis] Helix and unrecognised streams.

[Ian Malone]

Kind of an interim release, I have a copy of the Helix/RealPlayer Ogg
plugin working in the presence of unrecognised streams,
<href="http://www.srcf.ucam.org/~ibm21/omd_players/index.html#hxplugin>

The patches won't go into Helixcommunity until I've put in a joint
copyright document (and the stream end strategy patch still needs to
be completed), but they can be GPLed so if anyone wants the changes
just ask for them.

-- 
imalone