Pay UBI recipients on the ubilist

[bjarki781]

This pull request adds a switch, -ubi (off by default), that pays the addresses on the urUBI list (which you can view with getservicesaddresses, and then getubilist). Currently the wallet only pays the addresses on the list that were on it when it started up, might be fixed. And there is no checking that miner's are paying the correct addresses (but since the ubilist is open then it doesn't really matter). I also configured it so it only takes 90% of the miner's tx fees, but taxing needs more discussion, so this is something at least.

What still needs to be fixed is that miners don't seem to be accepting the UBI blocks, this needs some investigation.

[bjarki781]

Report on my final project in the Cryptocurrency course

My exact changes this time were to read on the new servicelist functionality and connect that system
to my UBI project. I had already spent some time on ubi.cpp, thinking of ways on implementing a UBI system but
I had been using a simple static file to store my UBI addresses. So this new addition allows anyone to add a
UBI recipient publicly to the ubilist/blockchain and then every other co-operating miner will be able to incorporate
this list into their blocks. What remains to do is basically bug hunting, a little pondering on verification (so only blocks
that pay the people on ubilist in the right order get accepted onto the blockchain) and maybe some discussion about how
we can tax the miner fairly. Then the project's next step would be authentication, which is more or less uncharted
territory.

[gstefans]

Is this ready or still waiting for testnet?

[bjarki781]

waiting for testnet.