* Update copyright year to 2021
* 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
* Rename Floonet to Testnet * Fix test * Rename test and docker