* Optimize crosslink verification logic and add more cache (#3032)
* make crosslink broadcast smarter and more efficient (#3036)
* adjust catch up speed to be a sane number
* Fix crosslink broadcast condition (#3041)
* validator stats regression due to apr bug fixed
* better coding style
* correctly computing apr accounting for epoch holes
* APRHistory for only 30 last epochs
* Fix viewID issue on prepared block during view change
* Add more checks and remove comments
* Fix lint
* update rlp encode pointer
* Revert go gen changes
* add go gen code
* [api] Fix proto to pass travis
Co-authored-by: Edgar Aroutiounian <edgar.factorial@gmail.com>
* [test] added schedule for sharding
* [test] refactored double_sign_test.go
* [test] comment out all test cases for now.
* [test] added record Copy method for testing
* [test] added the first test case in TestVerify
* [test] finished test TestVerify
* [test] Added test TestVerify, TestApplySlashRate, TestSetDifference
* [test] half through TestDelegatorSlashApply
* [test] fix the problem cause by unsafe usage of big.Int
* [staking] added the copy methods to validatorWrapper
* [test] added test cases for copy method for staking/validatorWrapper
* [test] added test case TestApply
* [test] added test case TestRate
* [test] fix the golint errors
* [test] removed commented out unit test code
* [test] remote the empty line in imports
* [test] moved copy methods to stake_testing module
* [test] removed usage of interface stateDB
* [test] removed empty lines in imports
* [test] fixed golint package name issues
* [test] removed a todo when writing code
* [test] moved record.Copy to staking/slash/test
* [rpc] Move all error definitions to error.go
* [core] Add function to read delegations from offchain data for a specific block
[rpc] Add GetDelegationsByDelegatorAt
* [rpc] Return error when calling all staking blockchain rpcs on auxillary shards
* [rpc] Rename to GetDelegationsByDelegatorByBlockNumber to follow naming conventions
* [rpc] Return error when requested block is greater than exists on chain
* [rpc] Fix lint errors
* [rpc] Fix check to not break on current block
* [rpc] Fix broken getBalance RPC
[rpc] Change getValidators to give balance at the end of the selected epoch or current block
* [rpc] Address PR comments
* [README] Update go version
* [rpc] Revert changes to Call
* [rpc] Move error checks to blockchain
* [rpc] Rename to ByBlock, because it takes a block as input
* [rpc] Small performance optimization for getting delegator information
Rongjian Lan
Leo Chen
Janet Liang
Edgar Aroutiounian
Jacky Wang
Ganesha Upadhyaya
Daniel Van Der Maden
Sebastian Johnsson
Jong Hyuck Won