Add UD value safeguards

If the indexer or Duniter nodes lies about current UD value, based on that the sent amount in a transfer would be wrong.

This value can be double-checked on two nodes, or checked into a range of value.

It should be done at least on Ğ1 currency:

  • 10 ≤ UDValue < 15: should be safe for one year at least

Prevent money transfer command from sending the wrong amount. Command editing the blockchain should prevent the user. money transfer. money balance and money history would display something wrong, but that’s kinda ok.

  • Display everywhere where the amount is used in UD, mostly commands in the money group, display the conversion rate (DU = 10.XX Ğ1).
Edited by Moul
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