ProgPoW

Ethereum ProgPoW mining algorithm, based on revision 0.9.2. This implements the ProgPoW algorithm (https://github.com/ifdefelse/ProgPOW). This algorithm is licensed under CC0 1.0 Universal (CC0 1.0) Public Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/) See the specification at https://github.com/ifdefelse/ProgPOW