bmt is a new package that provides hashers for binary merkle tree hashes on
size-limited chunks. the main motivation is that using BMT hash as the chunk
hash of the swarm hash offers logsize inclusion proofs for arbitrary files on a
32-byte resolution completely viable to use in challenges on the blockchain.

Dockerfile: multi-stage builds, Go 1.9

* cmd/evm: adds ability to run individual state test file

* cmd/evm: Fix statetest runner to be more json friendly

* cmd/evm, tests: minor polishes, dump state on fail

* core/vm: Make max_codesize only applicable post Spurious Dragon/158/155/161/170

* tests: Remove expected failure

* core: Fix flaw where underpriced locals were removed

* core: minor code cleanups for tx pool tests

Using a Timer over Ticker seems to be a lot better, though I cannot fully
account for why that it behaves so (since Ticker should be more bursty, but not
necessarily more active over time, but that may depend on how long window it
uses to decide on when to tick next)

core/vm: more benchmarks

travis, appveyor: bump Go to 1.9 stable

core, tests: implement Metropolis EIP 684

consensus, core, tests: implement Metropolis EIP 649

core/types: encode receipt status in PostState field

This fixes a regression where the new Failed field in ReceiptForStorage
rejected previously stored receipts. Fix it by removing the new field
and store status in the PostState field. This also removes massive RLP
hackery around the status field.

rlp: fix decoding long strings into RawValue types

core: add status as a consensus field in receipt

* cmd/evm, core/vm, internal/ethapi: Add 'err' to tracer interface CaptureEnd

* cmd/evm: fix nullpointer when there is no error

node: fix instance dir locking and improve error message

metrics: change MetricsEnabledFlag to be const

tests: enable Byzantium state tests for CI

Signed-off-by: Ti Zhou <tizhou1986@gmail.com>

vendor: update USB HID lib (fix macOS crash)