* separate modules for consensus snapshot chunks

* bulk of authority warp logic

* finish authority warp implementation

* squash warnings and enable authority snapshot mode

* test harness for PoA

* fiddle with harness

* epoch generation proof fixes

* update constructor code

* store epoch transition proof after block commit

* basic snap and restore test

* use keyvaluedb in state restoration

* decompress chunks

* fix encoding issues

* fixed-to-contract-to-contract test

* implement ancient block import

* restore genesis transition in PoW snapshot

* add format version method to snapshot components

* supported version numbers in snapshot_components

* allow returning of ancient epoch transitions

* genesis hash mismatch check

* remove commented code

multirust is deprecated.

* pass additional data when reporting

* checkout correct tests

* apply contract constructors at spec load time

* debugging

* do trie updates in two stages

* add lint exception to newly-dead constructor

* squash warning in RPC tests

* kill dead accountdb constructors

* restore accountdb constructors under test configuration

* use provided state root in spec, if it exists

* EIP-86

* Disable EIP-86 auto activation for now