zeusminer: support added for ZeusMiner scrypt ASICs

--set zus:freq=XYZ (default 328)
--set zus:chips=X (default 6)
--set zus:cores=X (default 8)
--set zus:ignore_golden_nonce (don't check probe response - buggy HW/FW)
It's not all of them, only a small portion. Most work fine and respond to the golden OB. Some do not, but still hash fine if you tell them to get on with it. Verified myself with user HW.