Fix for Istanbul sync (EIP-2200) (#271)

* Started adding tx tracing, try to fix GetCommittedState

* Fix lint

* Fix lint

* Fix lint

* Fix the collision tests

* Switch to boltDB with Yield

Yield boltdb transaction regularly to not block memory map resizing

* Added test

* gofmt -w

* Fix lint

* Revert "Switch to boltDB with Yield"

This reverts commit b42650d6e477ecd0f19fd017a29744384c249cac.

* Fix lint