This is a temporary fix, better checks need to
be performed once the whole process has been
validated.

Instead, use a go library that communicates with pcscd over a socket.

Also update the changes introduced by @gravityblast since this PR's
inception

consensus,core: shortcut uncle validation

params: set Rinkeby Petersburg fork block (4th May, 2019)

appveyor: Upgrade to go1.12.2

cmd: nuke geth bug, nobody is using it anyway

trie: there's no point in retrieving the metaroot

cmd/geth, internal, node, vendor: nuke geth monitor

* core/state: fix state iterator

* core: fix state iterator more elegant

core: re-emit new log event when logs rebirth

* node: switching prometheus flock location to tsdb

* rookie mistake

* cmd, accounts, internal, node, rpc, signer: insecure unlock protect

* all: strict unlock API by rpc

* cmd/geth: check before printing warning log

* accounts, cmd/geth, internal: tiny polishes

This PR makes it easy to generate and execute testcases for VM arithmetic operations. By enabling and running the testcase TestWriteExpectedValues, a set of json files are created which contain input and output for each arith operation.
The test TestJsonTestcases executes all of those tests.

While meaningless as is, this PR makes it less risky to make changes (optimizations) to the vm operations, since there will be a larger body of testcases.

* all: simplify timestamps to uint64

* tests: update definitions

* clef, faucet, mobile: leftover uint64 fixups

* ethash: fix tests

* graphql: update schema for timestamp

* ethash: remove unused variable

core: prefetch next block state concurrently