Rename bin to: ucoin
uforge: remove pksadd -> add send-publickey
ucoin: add send-join command
ucoin: refactoring
ucoin: add send-actu,send-leave commands
ucoin: update doc
ucoin: add vote-current command
ucoin: add vote-next command
Fix: user not taken in vote-current and vote-next
Fix: bad vote for vote-next
Fix: bad VotersChanges computing
Fix: bad basis number in membership requests