Ptalarbvorm is now in trunk

We're about ready to do a 1.2 alpha release from the ptalarbvorm tree,
and as such it's no longer experimental. I've replaced the theora svn
trunk with a copy of derf's experimental tree; please do subsequent
development toward the release there.

The old 1.1.x trunk is available as
http://svn.xiph.org/branches/theora-1.1 if you need it.

 -r