Add configurable donation/charity output address in for jobmanagers

[ericecook]

Several coins (including EMC2) require some portion of the coinbase reward to be paid out to a specific charity address, and PowerPool doesn't currently support this functionality (AFAIK)

All that is needed is configuring the address, and optionally the key to look for in the getblocktemplate response. For the ones I've looked at the required value is provided via a charityvalue.

This should be relatively simple to implement, and allow mining quite a few more coins.

Afterthought: It might be possible to cleanly include darkcoin's masternode payout in this code block.

[icook]

Ideally this would be something that would fall to cckit. Job generation would be currency specific functionality for a coin.

In the interim however patching it in might be worth it. Unsure.

[ericecook]

I'm a bit torn. My thinking was that having it be a directly configurable value would be more coin agnostic - and therefore a bit more flexible for the operator. But eventually I think it'd be better handled by cckit

[icook]

Yeah, I'll put in a few more days on cckit and see how close it is to acting as a replacement and reeval. Certainly if we want to expand our coin offerings then this is an important issue.