forked from Qortal/qortal
No more bitcoinj peer-group stalls, or slow startups, or downloading tons of block headers, or checkpoint files. Now we use ElectrumX protocol to query info from random servers. Also: BTC.hash160 callers now use Crypto.hash160 instead. Added BitTwiddling.fromLEBytes() returns int. Unit tests seem OK, but needs complete testnet ACCT walkthrough.