BDIP20: Increase Debt Ratio to 350%

This is a relaunch of BDIP14, with a lower max debt ratio (350% instead of 700%). https://gov.basisdollar.fi/#/basisdollar.eth/proposal/QmWt1TFA7VuEZ7ssHdu5gVxVN7NXFBLvkVtdVSvDcysnM9

In an earlier proposal, we had passed a maximum debt ratio of 70% https://gov.basisdollar.fi/#/basisdollar.eth/proposal/QmVteiki6KzC76oTstMm8f7RxeXNLNwYtHFxag89JnCmoD

We have now exhausted our supply of bonds. We need more bonds.

This proposal increases our debt ratio to 350% to ensure that the system makes a significant amount of bonds available without the need for lagged waiting period between passing proposals. There is a possibility we may not even need the full amount of additional bonds.

Proposal: Raise max debt ratio to 350%.

Advantage: Increasing the supply of bonds allows more BSD to be soaked up from the system.

Disadvantage: During expansion, there will be an increase in the amount of BSD issued when the increased amount of bonds are redeemed.