Fixed #31 - Immediately start another shuffle upon completion
Fixed #31 - Immediately start another shuffle upon completion

Added the 'had_a_completion_flg' which signals logic to short-circuit
other checks and immediately jump to selecting a new utxo and starting
up another protocol thread. This leads to faster turn-around to get
back to a pool when a shuffle completes.

fyookball/electrum,fyookball/electrum,fyookball/electrum