annotation && v2proxy add gasreturn and trade incentive && proxyV2 incentive test

contracts/DODOPrivatePool/impl/DPP.sol

@@ -12,6 +12,12 @@ import {IFeeRateModel} from "../../lib/FeeRateModel.sol";
 import {IERC20} from "../../intf/IERC20.sol";
 import {DPPTrader} from "./DPPTrader.sol";
 
+/**
+ * @title DODO PrivatePool
+ * @author DODO Breeder
+ *
+ * @notice DODOPrivatePool initialization
+ */
 contract DPP is DPPTrader {
     function init(
         address owner,

contracts/DODOPrivatePool/impl/DPPAdmin.sol

@@ -12,13 +12,19 @@ import {IDPP} from "../intf/IDPP.sol";
 import {IDODOApprove} from "../../intf/IDODOApprove.sol";
 import {InitializableOwnable} from "../../lib/InitializableOwnable.sol";
 
+/**
+ * @title DPPAdmin
+ * @author DODO Breeder
+ *
+ * @notice Admin of DODOPrivatePool
+ */
 contract DPPAdmin is InitializableOwnable {
     address public _DPP_;
     address public _OPERATOR_;
     address public _DODO_APPROVE_;
-
     uint256 public _FREEZE_TIMESTAMP_;
 
+
     modifier notFreezed() {
         require(block.timestamp >= _FREEZE_TIMESTAMP_, "ADMIN_FREEZED");
         _;
@@ -36,7 +42,6 @@ contract DPPAdmin is InitializableOwnable {
         _DODO_APPROVE_ = dodoApprove;
     }
 
-    //For Rebase Token
     function sync() external notFreezed onlyOwner {
         IDPP(_DPP_).ratioSync();
     }

contracts/DODOPrivatePool/impl/DPPStorage.sol

@@ -16,12 +16,6 @@ import {IFeeRateModel} from "../../lib/FeeRateModel.sol";
 import {IERC20} from "../../intf/IERC20.sol";
 import {PMMPricing} from "../../lib/PMMPricing.sol";
 
-/**
- * @title Storage
- * @author DODO Breeder
- *
- * @notice Local Variables
- */
 contract DPPStorage is InitializableOwnable, ReentrancyGuard {
     using SafeMath for uint256;
 

contracts/DODOPrivatePool/intf/IDPP.sol

@@ -25,8 +25,6 @@ interface IDPP {
     //=========== admin ==========
     function ratioSync() external;
 
-    //==============================
-
     function retrieve(
         address payable to,
         address token,