* [NC-1685] Fix BlockHashOperation so it handles blocks being added on forks and gets the hash of the block at the requested number on that fork rather than on the current canonical chain.
* [NC-1644] Cache block hashes across all transactions in a block.
The MiningCoordinator has been split into common, and ethhash
specific funcationality.
This adversely affects the JSON RPC, in that all mining related
RPCs are now generic based on the type of miner being used.
The EthHashMinerExecutor is comprised of both EthHash specific
functions as well as common functions which will be useful to other
consensus mechanisms.
As such the common functionality has been extracted to a parent class,
leaving ethhash specific functionality in the child.
Responsible for mining a block if the local node address
is a validator, and has not recently mined a block.
This has necessitated a slight rework of helper functions,
and shuffling of tests.
The EthHashBlockMiner contains both the generic mining capabilities
and the EthHash JSON specific API.
The generic capabilities have been extracted into a base class which
can be reused for Clique (or other) consensus mechanisms.
Adrian Sutton
tmohay
S. Matthew English
Chris Mckay
PegaSys Admin