cmd/tester initiates staged sync, and unwind (but not reorg) (#758)

* First push

* Remove batch from Blockchain

* Fix compile error in cmd/integration

* Fix compile errors in cmd/state

* Fix compile errors

* Save changes

* Fix core tests (skip tx tests)

* More test fixes

* Fix compile error

* Fix formatting

* Fix formatting

* Fix lint

* Fixes

* Skip some miner tests

* Fix tests

* Cleanup