Introduce intermediate hashes stage (#634)

* Query progress

* Run stage4 offline

* More thorough resetState

* Correct BlockNumber

* Fix formatting

* State loop

* do every 200k blocks

* Shift to 6.6m

* Close dbs in tests

* Stage2 with option of no reset

* every 100k blocks

* Reset state before stage5

* Introduce another stage

* Check compile errors

* Fix linter

* Fix linter

* Disable unreliable test

* Fix test

* Remove unreachable code