Use .name instead of bukkit.getName()
Fix deathmatch score limit bug

- Do not stop game if score limit is set to 0.
- Use team score when checking score limit for team games.
Rework channel permission design to fix bugs

- Keep standard channel admins separate from bukkit.hasPermission
  admins. This means that bukkit permission updates can be applied
  immediately.
- List both kinds of admins on /ro chan op command.
- Apply robofish.all_chan_op permission to default channel.
Don't set attr on bukkit sender class

- Name is read only
- It probably best to leave it alone anyway.
Fix chan op and set commands receiving wrong args
Fix score_mode option validation