* PoC utility

* Headers cmd

* headers download command

* Fix lint

* Send handshake

* Receive Status message

* Better error messages

* Messages

* Fix

* Fix lint

* Print block number for NewBlockMsg

* Fix lint

* added eth_getStorageAt

* used uint32

* now its 256

* incarnation

* Start memory prof

* Fix rpctest

* Fix rpctest

* Attempt to fix the leak

* Remove http pprof

* Print tx pool stat

* Print tx pool stats

* Chart gas prices

* Print gaps

* Don't check canonical

* Hack

* Remove hack

* Fix stages

* fixState

* Canonical gaps

* Gas burnt vs avg gas price

* Revert changes in tx pool

* Fix NPE

* Remove fixStages

* Fix NPE

* integration check history

* reset tx pool

* reset tx pool

* reset tx pool

* it compiles

* after recent master

* fix linters warnings

* grpcV7

* go mod tidy

* unmarshall adresses or adress

* fix linters

* after cr

* after cr

* after cr

* after cr

* fix tests

* remove dev version

* it compiles

* mod tidy

* fix bin deps

* use stable version of grpc

* switch back to master constructor

* switch back to master constructor

* add a bit docs

* add a bit docs

Co-authored-by: Alexey Akhunov <akhounov@gmail.com>
Co-authored-by: alex.sharov <AskAlexSharov@gmail.com>

This reverts commit f19bb0a3.

* fixed offset

* rm unused

* externalize default stages

* initialize with the right stages

* fix some bugs

* fix

* linters

* Warmup

* Log the warmup

* Make warmup interruptible

* Make warmup a command line option for HDD

* Activate hdd flag

* added ws support

* fixed log

* ws over json rpc

* lint

* fixed bad req

* added ws support

* fixed log

* Unwind over unwound, no rollbacks

* Exclude bits only for StagedSync

* Nitpick

* Use Append for changesets and receipts

* Fix lint

* Delete all receipts on unwind

* Fix lint

* Fix unwind keys for changeset

* Fix test

* Use writeReceipts flag

* Revert to Append

* Delete receipts too when resetting

* First algorithm

* Update doc

* Second algorithm implemented

* Prepend (unfinished)

* More on prepend

* More fixes

* Change CalcDifficulty interface

* fix make test

* Fix formatting

* Another test

* More on Preprend

* Another test for Prepend

* More tests for Prepend

* More tests for Prepend

* Move files to turbo

* Add another test for Prepend

* Started adding Append algorithm

* More work on Append

* Start changing the terminology

* Split trees into segments

* More fixes

* Fix compilation

* Connect

* FindAnchors, FindTip

* Tip has anchor and not anchorParent field

* Remove Prepend and Append

* Add Connect

* NewAnchor algorithm

* More to recovery from files

* Add more to AddAnchor

* Request more headers

* Header fix-sizes serialisation

* Upgrade CI to 1.15

* Fix lint

* Fix lint

* replace RLP with fixed-sized serialisation

* Fix lint

* More algos

* Fix lint