* 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
* optionally use no mangling for accountdb
* add the recorder module
* get_recorded for tries, no virtual dispatch on readonly tries
* add recording test
* Minor additions to allow resetting of code.
* Add test.
* Provisional DAO hard-fork proposal.
* Change to reflect latest HF spec.
* Include extradata restrictions and overrides.
* Introduce new tests.
* Update tests to new spec format.
* Allow JSON chain spec fields to be optional.
* Remove superfluous definitions. Fix overflow risk.
* Fix build.
* Add missing file.
* Remove old flag.
* Update to latest address set.
* Update tests and test spec to latest.
Change the mining default to release only on own transactions.
