Change the base unit of tokens to Daric instead of uDaric

[RiccardoM]

Currently the application is using the udaric as the token unit. Instead, we should use Daric to make things simpler for the user (1 Daric = 1.000.000 udaric). If #7 is implemented, you can also use the following query to get the details of various token units:

query TokenUnits {
  token {
    token_units {
      denom
      exponent
      token_prices {
        price
        timestamp
      }
    }
  }
}