The eth/61 protocol was disabled in #2776, this commit removes its
message handlers and hash-chain sync logic.

cmd, core, eth, miner, params, tests: finalize the DAO fork

circleci: enable docker based hive testing

vm: Replace some SstoreClearGas with SstoreResetGas

Godeps, rpc: switch back to package npipe

This adds compatibility with Go 1.7, where context has
moved into the standard library.

The named pipe implementation from go-winio has some issues
that need to be addressed before we can use it again.

core: added CheckNonce() to Message interface

eth/downloader: return invalid chain (peer drop) on import fails

core: solve a remote-import/local-mine data race

README: expand with "Running Geth" section

containers/docker/master-alpine: drop gmp dependency

eth: disable eth/61 to prepare for more elaborate fork sync algos

README: fix build->built typo

(cherry picked from commit e271fd57132763f39c6993a35e6c063aac3af4f1)

cmd, common, console, eth, release: drop redundant "full"s

eth: separate common and full node-specific API and backend service

cmd/geth: fix the import error message

cmd/geth: include the error message on import failure

Revert faulty DAO soft-fork