Store receipts separately - one record per tx (#1271)

* squash

* add --database flag to integration

* clean

* split to 2 buckets

* split to 2 buckets

* split to 2 buckets

* split to 2 buckets

* split to 2 buckets

* save progress

* save progress

* improve test

* improve test

* save progress

* change app logic

* change app logic

* return err from rawdb package

* don't clean automatically

* don't clean automatically

* clean

* clean

* clean

* don't rely on `make clean`

* improve cbor code

* clean

* clean

* clean

* fix tests

* rebase master

* stop on error: headers stage

* make TxDb walk and multiwalk safe

* Fix panics

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