Changes:
- Added Bill and Big Penguins themes
- New ToonCheckBlocked() function to avoid changing toons dying immediately
- Added Brian Chu's superpenguin that can face in both directions
- Action toons that move left or right no longer get stuck at walls
- Use `--squish' to kill the toons with the mouse
- Code uses _() around strings to allow future i10n
- Desktops only: redraw icons by sending expose events to root window
- Enabled multiple themes to be selected
- Use the `--all' option to run all available themes simultaneously
