eth: send but not announce block to peers if propagate is true

cmd/puppeth: support blacklisting malicious IPs on ethstats

core/vm, crypto/bn256: fix bn256 use and pairing corner case

core/vm: implement RETURNDATA metropolis opcodes

core/vm: implement metropolis static call opcode

 * Fix STATICCALL so it is able to call precompiles too
 * Fix write detection to use the correct value argument of CALL
 * Fix write protection to ignore the value in CALLCODE

core/vm: metropolis precompiles

swarm: fix megacheck warnings

accounts, console, internal: support trezor hardware wallet

 * Update modexp gas calculation to new version
 * Fix modexp modulo 0 special case to return zero

tests: update tests, use blockchain test "network" field

* core: Remove unused `state` parameter to `NewEnv`.

`cfg.State` is used instead.

* core/vm/runtime: remove unused import

Blockchain tests now include the "network" which determines the chain
config to use. Remove config matching based on test name and share the
name-to-config index with state tests.

Byzantium/Constantinople tests are still skipped because most of them
fail anyway.

* eth/downloader: fix race in downloadTesterPeer

Signed-off-by: Ivan Daniluk <ivan.daniluk@gmail.com>

* eth/downloader: minor datarace fix cleanup

* contracts: fix megacheck errors

* contracts: drop useless sleep, lets see what breaks

* les: fix megacheck warnings

* les: fixed testGetProofs

* whisper: fix megacheck warnings

* whisper/whisperv5: regenerate json codec to fix unused override type

* crypto: fix megacheck warnings

* crypto/ecies: remove ASN.1 support

core: fix txpool journal and test races

* ethdb: add basic sanity test

* ethdb: test MemDatabase

* ethdb: add parallel tests