Add property tests for EveryoneVotes implementation
This commit implements property tests for the EveryoneVotes implementation asserting that: * votes cast by eligible voters are successfully verifiable under the same voting committee, * fake (illegal) votes are successfully rejected, and * certificates forged by multiple votes can be verifiable under the same voting committe Co-authored-by: Nicolas BACQUEY <[email protected]> Co-authored-by: Thomas BAGREL <[email protected]> Co-authored-by: Agustin Mista <[email protected]>