* owning views of blockchain data

* port blockchain and client traits to owning views

* fix ethcore tests

* use strong headers and bodies in ethcore_light

* port ethsync to use owning views

* port rpc to owning views

* port parity informant and blockchain export

asynchronous rob authored Dec 27, 2016 and Arkadiy Paronyan committed Dec 27, 2016

* initial untry sweep

* restore try in ipc codegen, fix inference

* change a few missed try instances

* constructor spec

* execute under wrong address

* create under correct address

* revert

* move genesis block lookup

* remove env_logger

* Allow sync reorg up to pruning history size

* Peer difficulty tracking

* Abort downloading block if received with NewBlock

* Set pruning history to 1200

* Renamed history size field

* configurable CHAIN_ID

* set CHAIN_ID for Ethereum Classic

* derive(Binary) -> binary

* ethcore types refact

* fixup ethcore

* make binary optional

* fix common types

* fix updater

* remove condition

Closes #3861