a dgp vote will keep unfinished, as no more voters call dgp contract

[allanzengdbc]

when the last voter votes for this type of proposal, it check expiration or voters count fulfilled, if either fulfilled, vote finish.

while voters count not fulfilled, if no more voters call dgp contract, the current vote has no chance to check if it finished.

if you start a new proposal of the same type of the current unfinished proposal, it throws exception.

if(currentProposals.keys[_type].proposal!=_proposalAddress) throw;

even though the current proposal expires, it requires a govKey or adminKey addr call addAddressProposal with the right argument to end the current unfinished proposal.