Change ucoind CLI: add 'start' and 'config' commands
Change ucoind CLI: add 'reset' command
Refactoring: centralize Merkles updates
Add ucoind update-merkles command (for public key, memberships)
ucoind update-merkles: added transactions
Issuance TX must have all coins targeting the same #amendment
Prevent from voting previous amendment
Prevent from sending memberships for previous amendment