Release mainnet-index1.6.2 

Release mainnet1.6.1 

update ENABLE_TRANSACTION_HISTORY true 

Skip fast path for mblock if its rblock confirmation is too old (#944) * add profiling JSON-RPC * ignore stale parent root for new minor block fast path * adjust rblock staleness to 4096 * Revert "add profiling JSON-RPC" This reverts commit 9e70fb8. * skip shard sync from peer tip if its root block has fork * some fix * some fix * fast path skips mblockk with rblock fork * fix * check confirmed_tip not None * fix Co-authored-by: Qi Zhou <qzhou64@gmail.com>

update ENABLE_TRANSACTION_HISTORY=true 

Update mainnet config for root chain posw (#942) * Update mainnet config for root chain posw * performance improvement

Turn on indexing switch for mainnet 1.5.0 

Users/pingke/eip155 signer test (#926) * reformatted files * reformatted files * fix typo * fix typo * add content * fix test case * fix config bug * fix issue * add test case * fix test * fix test * revert posw change * revert posw change * fix test * change jsonrpc to support eip155 signer * resolve comments * reformat * add validation for tx.version = 2 * resolve comments * reformat * resolve qi's comments * fix estimatesGas (#924) * fix tests * fix test * fix test * fix test * fix bug * change Eth_Chain_Id = network_id * fix bug * fix note * add from_shard_key and to_shard_key * update ENABLE_EIP155_SIGNER_TIMESTAMP value * update message * fix bug * fix bug * fix but * add test_eip155_signer_attachment test * fix test case * update eip155 test case Co-authored-by: 516108736 <516108736@qq.com>

Add prev_headers to EVM state (#913) * Remove recent uncles from state * Add prev_headers to EVM state * Fix block hash getter in vm * Fix pre_headers set in shard_state * Fix tests * Fix prev headers update and add test case * Minor

Add prev_headers to EVM state (#913) * Remove recent uncles from state * Add prev_headers to EVM state * Fix block hash getter in vm * Fix pre_headers set in shard_state * Fix tests * Fix prev headers update and add test case * Minor