Test whether setting book type of DVD+R[W] discs to DVD-ROM makes them
compatible with drives that otherwise don't like them.

Integrate the few remaining session videos when they are available.

Check audio volume and cutting for newly added or changed sessions:
16/{01,07-12},17/06

Improve audio quality
- Filter out constant background noise from some of the talks.
- Compress audio volume?

Recheck video cutting.

Change title font to match Debconf logo better?  (It uses ITC Officina
sans and serif fonts, which are non-free.)
