* revert some changes, could be buggy (#10399)
* 10000 > 5000 (#10422)
addresses #10418
* fix panic when logging directory does not exist, closes#10420 (#10424)
* fix underflow in pip, closes#10419 (#10423)
* ci: clean up gitlab-ci.yml leftovers from previous merge (#10429)
* Update hardcoded headers for Foundation, Ropsten, Kovan and Classic (#10417)
* update foundation to #7262209
* update kovan to #10434561
* update ropsten to #5027841
* update classic to #7555073
* Update Ropsten headers to #5101569
* ethcore: update hardcoded headers for foundation
* ethcore: update hardcoded headers for ropsten
* ethcore: update hardcoded headers for kovan
* ethcore: use consistant formatting
* ethcore: restore spaces after colon in chain spec
* ethcore: fix bootnodes in chain specs
* ethcore: fix bootnodes in chain specs
* ethcore: enforce newline at the end of chainspecs
* ethcore: propose hardfork block number 4230000 for ropsten
* ethcore: propose hardfork block number 9000000 for kovan
* ethcore: enable kip-4 and kip-6 on kovan
* etcore: bump kovan hardfork to block 9.2M
* ethcore: fix ropsten constantinople block number to 4.2M
* ethcore: disable difficulty_test_ropsten until ethereum/tests are updated upstream
- Update foundation hardcoded header to block 6219777
- Update ropsten hardcoded header to block 3917825
- Update kovan hardcoded header to block 8511489
* Insert Kovan hardcoded headers until #7690241
* Insert Kovan hardcoded headers until block 7690241
* Insert Ropsten hardcoded headers until #3612673
* Insert Mainnet hardcoded headers until block 5941249
* move common forks and parameters to common params
* port specs over to new format
* fix RPC tests
* parity-machine skeleton
* remove block type
* extract out ethereum-specific methods into EthereumMachine
* beginning to integrate Machine into engines. dealing with stale transitions in Ethash
* initial porting to machine
* move block reward back into engine
* abstract block reward logic
* move last hash and DAO HF logic into machine
* begin making engine function parameters generic
* abstract epoch verifier and ethash block reward logic
* instantiate special ethereummachine for ethash in spec
* optional full verification in verify_block_family
* re-instate tx_filter in a way that works for all engines
* fix warnings
* fix most tests, further generalize engine trait
* uncomment nullengine, get ethcore tests compiling
* fix warnings
* update a bunch of specs
* re-enable engine signer, validator set, and transition handler
* migrate basic_authority engine
* move last hashes into executedblock
* port tendermint
* make all ethcore tests pass
* json-tests compilation
* fix RPC tests: change in gas limit for new block changed PoW hash
* fix minor grumbles
* validate chainspecs
* fix broken import
* fix transaction verification for pre-homestead
