新生v2

- groups, transactions消す
- rename
    - request → application
    - applicationの状態
        - Submitted (そのまま)
        - FixRequired → ChangeRequested
        - Accepted → Approved
        - Rejected (そのまま)
        - Completed → PaymentFinished
    - userのAdmin → AccountManager
- partitionを追加する
    - name, budget, lifetimeを持つ
- application
    - partitionを持たせる