eth/tracers: fix err in 4byte, add some opcode analysis tools

* core: move test util var/func to test file

* core: remove useless func

* cmd/faucet: authGitHub is not used anymore

* cmd/puppeth: remove not used code

* debug: Use pprof goroutine writer in debug.Stacks() to ensure all goroutines are captured.

* Up to 64MB limit, previous code only captured first 1MB of goroutines.

* internal/debug: simplify stacks handler

* fix typo

* fix pointer receiver

* core/asm/compiler: correct comments typo

core/asm/compiler: correct comments typo

* Correct comments typo

This package was meant to hold an improved 256 bit integer library, but
the effort was abandoned in 2015. AFAIK nothing ever used this package.
Time to say goodbye.

* eth: made changes to conform better to the golint standards

* eth: fix comment nit

* common: all golint warnings removed

* common: fixups

travis, appveyor: update to Go 1.10.3

Prior to this change, when geth was started with `geth -dev -rpc`,
it would report a network id of `1` in response to the `net_version` RPC
request. But the actual network id it used to verify transactions
was `1337`.

This change causes geth instead respond with `1337` to the `net_version`
RPC when geth is started with `geth -dev -rpc`.

* vm/test: add tests+benchmarks for mstore

* core/vm: less alloc and copying for mstore

* core/vm: less allocs in sload

* vm: check for errors more correctly

This commit adds all changes needed for the merge of swarm-network-rewrite.
The changes:

- build: increase linter timeout
- contracts/ens: export ensNode
- log: add Output method and enable fractional seconds in format
- metrics: relax test timeout
- p2p: reduced some log levels, updates to simulation packages
- rpc: increased maxClientSubscriptionBuffer to 20000

 #15685 made peer_test.go more portable by using random free port instead of hardcoded port 30303 (#15687)

Improves test portability by resolving 127.0.0.1:0
to get a random free port instead of the hard coded one. Now
the test works if you have a running node on the same
interface already.

Fixes #15685

console/console: correct some comments typo

core/asm/lexer: correct comments typo

This PR fixes a retriever logic bug. When a peer had a soft timeout
and then a response arrived, it always assumed it was the same peer
even though it could have been a later requested one that did not time
out at all yet. In this case the logic went to an illegal state and
deadlocked, causing a goroutine leak.

Fixes #16243 and replaces #16359.
Thanks to @riceke for finding the bug in the logic.

ToECDSAPub was unsafe because it returned a non-nil key with nil X, Y in
case of invalid input. This change replaces ToECDSAPub with
UnmarshalPubkey across the codebase.

internal/ethapi: reduce pendingTransactions to O(txs+accs) from O(txs*accs)

metrics: fix gofmt linter warnings