New Features

1. Addition of RPC interfaces:
   a) interface debug_getHeaderRlp to the debug module
   b) new interface txpool_contentFrom to the txpool module
   c) interfaces to eth/hpb module: eth_getHeaderByNumber, eth_getHeaderByHash, eth_fillTransaction
2. Added support for GraphQL query.

Bug Fixed

1. Consensus Algorithm
   a) Fixed a bug to preempt possible malicious node activity
   b) Fixed a bug occasionally creating bad blocks at verification
2. Virtual Machine
   a) Upgraded the VM core code to the latest ETH version (V1.10.16)
   b) Fixed datacopy bug