* Remote DB initial commit

* Fix lint

* Fix lint

* Fix lint

* Fix

* Minimize changes

* Fetching results of eth_getProof

* Dump 5 levels of the trie in a file for repeated runs

* Drill down to 6 levels of the trie

* Fix lint

* Fix lint

* Fix lint

* verifySnapshot to check accounts with emptyRoot

* Descend into short nodes

* Latest tool fixes

* Fix lint

* Fix state properly working

* use map instead of rb tree

* GetModifiedAccounts

* introduce tuples

* linters

* linters

* init puts

* init maps

* remove GetSortedKeys

* fix string bucket case

* use append in tuples

* fix tuples

* fix tests

* all tests are green

* fmt

* fmt

* rename tuple to tuples

* return errors

* fmt

* Further fixes

* Repace 1000 with a symbol

* BadgerDatabase MemCopy

* fix err shadowing

* BadgerDatabase MultiPut & NewBatch

* Remove goOn from MultiWalk & MultiWalkAsOf

* BadgerDatabase MultiWalk. Scaffolding for testing Badger in blockchain_test

* Badger Flag

* fix error logging

* Split IdealBatchSize between BoltDB and BadgerDB

* NewEphemeralBadger

Preparations for computing root without modifying the trie

* Refactor `structural*` files.

* some refactor

* dry hashbuilder a bit

* rename constants back to the magic rlp values

Prine tries (in memory) in the same cycle as db commits

Fix data races and goroutine leaks

Tests for inserting incorrect root hash blocks

Start integrating Badger DB

Fix typo in download-only flag