Document GenesisProtocol parameters

[dkent600]

Arc documentation says nothing about the function of any of the GenesisProtocol parameters. The solidity code contains cursory documentation, but not sufficient. It would be better if edited for English, provided units (like Wei, seconds, etc), and described all the referenced concepts, for example "threshold" and "quite ending".

[dkent600]

Particularly needing further explanation are all four constant A and B params (what do they really mean in concrete terms relating to a proposal vote?), and votersReputationLossRatio and votersGainRepRatioFromLostRep.

[dkent600]

Here are the Arc docs on this: https://daostack.github.io/arc.js/api/interfaces/GenesisProtocolParams/

These can be improved too, at minimum because they lack some of the information I'm asking for above in the Arc docs. Comments invited.