* The front-end for each hard-fork, also EIP-160.
* Address EIP161 a/c
* Include EIP-161b
* EIP-161 part d.
* Fix test build.
* Fix one test, add another.
* Fix use of bloom & renaming.
* Initial groundwork for EIP-155
* Fix minor bug.
* Fix all tests finally.
* Rest of EIP-155.
* Add tests for EIP-155 algorithm.
Update transaction tests validation.
* Minor reformat.
* Address grumbles.
* Remove unused code.
* Fix SUICIDE gas mechanism and add consensus tests.
* Remove commented code.
* Set Frontier hardfork block number
* Fix warning.
* Transaction tests,
* no longer export action_params
* remove transaction, header, receipt re-rexports from common
* remove env_info and builtins re-exports from common
* remove everything but util export from common
* replace common usages with util, remove module
* add a prelude module for ethcore-bigint
* Handle reorganizations in the state cache
* Renamed and documented a few methods
* Basic test
* Renamed pending to buffered
* Updated cache on sealed block
* More renames and updated documentation
* Minor doc tweaks
* State to track dirty accounts
* Removed clone_for_snapshot
* Renaming stuff
* Documentation and other minor fixes
* Replaced MaybeAccount with Option
* bloom crate link
* database layout and outdated tests
* state db alterations
* v10 migration run
* using arc
* bloom migration
* migration fixes and mess
* fix tests
* State cache
* Reduced copying data between caches
Whitespace and optional symbols
* Reduced copying data between caches
Whitespace and optional symbols
* Set a limit on storage cache
* Style and docs
* Avoid cloning clean stuff
* Don't clone state when closing/locking blocks
* handle errors in commit
* revert `close_and_lock` changes
* defer state root update until post state commit
* optionally use no mangling for accountdb
* add the recorder module
* get_recorded for tries, no virtual dispatch on readonly tries
* add recording test
