refactor vaults and cdp_treasury module, remove debits module #46
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直接拿掉了debits模块, Trait CDPTreasury增加了两个接口供vaults模块向指定账户增发或销毁aUSD, DebitBalance和DebitAmount都放到了vaults::Trait中定义。 现在系统债务由treasury维护, cdp债务由vaults维护, 总债务是aUSD的发行量。感觉treasury的接口定义和命名可以再调整, 等加上盈余拍卖