Decide on supermajority threshold implementation

[drewstone]

Overview

Supermajorities are determined by any threshold larger than the majority. For byzantine fault tolerance, we commonly tolerate roughly 1/3 faulty nodes, therefore a good candidate is to ensure 66% supermajority for proposals to pass or some larger value.

Proposal

Decide on one of the following:

1. Hard code 66% or 75% or some sufficient supermajority threshold.
2. Set a default threshold such as 66% and allow it to be voted upon by the council as long as it remains a supermajority threshold.