Added tests for transaction: make_fully_valid, serialise, get_dust_return_pubkey.
Added tests for transaction: make_fully_valid, serialise, get_dust_return_pubkey.

jarymoth/counterpartyd,CounterpartyXCP/counterparty-lib,CounterpartyXCP/counterparty-lib,tokenly/counterparty-lib,F483/counterparty-lib,F483/counterparty-lib,monaparty/counterparty-lib,stefcrypto/counterparty-lib,coinwarp/dogeparty-lib,monaparty/counterparty-lib