Release/pre prod (#711)

* 2.16.1

* add api of contract code (#684)

Co-authored-by: MIMIEYES <pierreluohao@gmail.com>

* Modify a document

* en

* p19

* 2.19.0

* 2.19.0

* 2.19.0

* add cross asset cmd check

* 2.19.0

---------

Co-authored-by: niels1286 <niels@nuls.io>
Co-authored-by: MIMIEYES <pierreluohao@gmail.com>
Co-authored-by: Jason <jasonchou82111@gmail.com>
Co-authored-by: cobble586 <cobble2626@gmail.com>

module/nuls-cores/src/main/java/io/nuls/chain/rpc/cmd/AssetCmd.java

@@ -201,9 +201,9 @@ public Response mainNetAssetReg(Map params) {
             if (dbChain.isDelete()) {
                 return failed(CmErrorCode.ERROR_CHAIN_REG_CMD);
             }
-            if (assetService.assetExist(asset) && asset.isAvailable()) {
-                return failed(CmErrorCode.ERROR_ASSET_ID_EXIST);
-            }
+//            if (assetService.assetExist(asset) && asset.isAvailable()) {
+//                return failed(CmErrorCode.ERROR_ASSET_ID_EXIST);
+//            }
             /* Assembly transaction sending (Send transaction) */
             Transaction tx = new AddAssetToChainTransaction();
             LoggerUtil.COMMON_LOG.debug("version= {}", ChainManagerUtil.getVersion(CmRuntimeInfo.getMainIntChainId()));