Allow change (lower) DHF DAO Proposal's parameter(s) after creation: Daily Pay (and maybe others)
Joe writes a proposal for 50 HBD / day. He asks Alice and Bob what they think of it. Alice, being Joe's spouse, thinks it is a great proposal and immediately votes for it. Bob however thinks Joe is adding great value, but finds a daily amount of 35 HBD more reasonable. Joe wants to ask Alice to marry her and he is just a bit short on cash for the rings, so he agrees with Joe to change the daily pay to 35 HBD. With an update in a proposal UI Joe lowers the metadata
asset daily_payto 35 HBD.
This was discussed in HiveDeveloper Biweekly 3 meeting.
update_proposalmethod including evaluator, api functions.