Proposal: Allow buying the sasha-assumed debt

To reduce the default risk, we need an option which can buy sasha-assumed debt.

For example,
①Implement a feature which can export debt position as D-token.
②D-token can be sold in WX or VIRES official UI. This price is much smaller than Vtoken. (cf : 0.02USDN)
③Supplyers can buy and import Dtoken to his account
④Supplyers can liquidate this debt from his own supply or Vtoken

That’s how, we can reduce Sasha-assumed debt’s risk.