TRC : new, clean network parameters.

- IDENTIFIER & PREFIX updated for both production+testnet TRC networks.

 - This should separate shares traffic from very old nodes, and also
   shares from p2pool TRC nodes using pre-mandatory builds, thus being
   on forked chains.

 - TRC p2pool seednodes will support new networks only once pull request
   is merged, waiting for Forrest feedback, just in case Forrest sees a
   better way to do this.