Mecanix found that we are not updating the difficulty mask properly

[adammwest]

for formatting!

• Pools have huge varying initial difficulties from 1k-> 1M
• Asic hashrate statistics are dependant on high sampling frequency of nonces, which is only the case when chip difficulty is low
• Pool difficulty changes should not change hashrate sampling frequency
• Anything editing the ticket mask must be a power of 2 limited to the correct bounds