* 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,
* State to track dirty accounts
* Removed clone_for_snapshot
* Renaming stuff
* Documentation and other minor fixes
* Replaced MaybeAccount with Option
* 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
* optionally use no mangling for accountdb
* add the recorder module
* get_recorded for tries, no virtual dispatch on readonly tries
* add recording test