pull changes from bitcoin for FindMostWorkChain
pull changes from bitcoin for FindMostWorkChain

domob1812/crowncoin,domob1812/crowncoin,Crowndev/crowncoin,Crowndev/crowncoin,domob1812/crowncoin,Crowndev/crowncoin,Infernoman/crowncoin,domob1812/crowncoin,Crowndev/crowncoin,Infernoman/crowncoin,Crowndev/crowncoin,domob1812/crowncoin,Crowndev/crowncoin,Infernoman/crowncoin,domob1812/crowncoin,Infernoman/crowncoin,Infernoman/crowncoin,Infernoman/crowncoin