Implement ProgPOW, extension set for Ethash Proof of Work to block asics

[ghost]

Reference implementation : https://github.com/ifdefelse/ProgPOW

WIP master branch rebase: ifdefelse/ProgPOW#17 , https://github.com/EthersocialNetwork/ethminer-ProgPOW/commits/progpow-master-rebase , #1692

I would like to request implementing ProgPOW as a part of ethminer, to support features of progpow mining along with wip geth node or parity node, with GPU CUDA & OpenCl support.

I believe ProgPOW's spec is almost finalized for production use and I think it is a good time to start implementing final changes on ethminer repository also.

cc @chfast @ifdefelse @hackmod

[chfast]

There are not objections to ProgPoW integration, but there are no volunteers nor funding to have it done.

[ghost]

@chfast @hackmod and I am ready to volunteer for ProgPOW integration, all we need is some code reviews and pr merge from ethminer maintainers

[AndreaLanfranchi]

We need to support both algos. Ethash and progpow. We can't switch to ProgPow abruptly. Ethminer must continue to live for other ethash coins

[ghost]

@AndreaLanfranchi Yes this is the main point of ProgPOW implementation on ethminer, can you contribute the code for switch?

[ghost]

Here is the code that is rebased from master branch, we only need switch logic on the code #1692

[hackmod]

See also ethereum/ethash#111 (ethereum/ethash ProgPoW v0.9.1)
and some open-ethereum-pool test result.

[hackmod]

the main reason I was trying to rebase manually is that the current ethminer use chfast/ethash and it already support ProgPoW.

[ghost]

First version available on https://github.com/gangnamtestnet/progminer