Original commit message from CVS:
* docs/design/part-TODO.txt:
Mention QoS as an ongoing work item.
* docs/design/part-buffering.txt:
New doc about buffering that needs to be fleshed out
at some point.
* docs/design/part-qos.txt:
More QoS policy for decoders/demuxers/transforms
* docs/design/part-trickmodes.txt:
Small update.
