Update transfer authorization interface

TransferAuthorization.sol

@@ -25,6 +25,7 @@ interface TransferAuthorization {
 		uint256 value;
 		uint256 yay;
 		uint256 nay;
+		uint256 blockNumber;
 		int8 result; // -1 rejected/vetoed, 0 = completed, 1 = voting, 2 = approved
 	}
 
@@ -39,6 +40,8 @@ interface TransferAuthorization {
 	function nextSerial() external view returns (uint256);
 	function getSerialAt(uint256 _idx) external view returns (uint256);
 	function requests(uint256 _serial) external view returns (Transaction memory);
+	function requestSenderIndex(address _sender, uint256 _idx) external view returns (uint256);
+	function requestRecipientIndex(address _recipient, uint256 _idx) external view returns (uint256);
 	function createRequest(address _sender, address _recipient, address _token, uint256 _value) external returns (uint256);
 	function yay(uint256 _serial) external returns (bool);
 	function nay(uint256 _serial) external returns (bool);