script: Implement OP_CHECKMULTISIG[VERIFY].  Fix CastToBigNum()
script: Implement OP_CHECKMULTISIG[VERIFY].  Fix CastToBigNum()

jgarzik/pynode,petertodd/tx-flood-attack,petertodd/dust-b-gone,robertsdotpm/python-bitcoinlib,petertodd/stealth-addresses-ref-implementation,daedalus/pynode,daedalus/python-bitcoin_r,jgarzik/python-bitcoinlib