Improved Tier Visibility for Server / Client

![yay](https://f.cloud.github.com/assets/4504069/693507/881c9a90-dc8d-11e2-8bfb-28054cd4e010.png)

Various Server and Client functions now carry data involving the Tier of a battle, allowing:

- New "Tier" section of the "Battles" tab, which allows players to sort battles by Tier.
- Tooltips now display the Tier of the battle a player is involved in.
- Server now displays the tier of battles that start.

Concerns:

- Mixed battles do not display as mixed, but as the tier of the person receiving the challenge / searching for battle.

- Unnecessary passes? It's possible the "tier" information has been put into functions when the data could be found in other ways.

- wow did i break everything