* HardFork4 initial commit * HF4 obsoletes secondary_scale, which becomes an nonce extension 8->12 bytes * fix TESTNET_FOURTH_HARD_FORK height * improve predicted height for testnet fork on dec 8 * move local variable as suggested by antiochp
* pass slices around and not refs to vecs * use slice.swap() * use inputs() not body.inputs
* rework pool tests to use real chain (was mock chain) to better reflect reality (tx/block validation rules etc.) * cleanup