* eth/fetcher: check the origin of filter task

* eth/fetcher: add some details to fetcher logs

If the file already existed, the WriteResponse.Size was being set
as the length of the entire file, not just the amount that was
written to the existing file.

Fixes #15216

The accountCache contains a file cache, and remembers from
scan to scan what files were present earlier. Thus, whenever
there's a change, the scan phase only bothers processing new
and removed files.

Fixes #1024

cmd/puppeth: support managing fork block in the chain config

vendor: update liner to fix docker and mips bugs

accounts/usbwallet: handle bad interface number on macOS

internal, accounts, eth: utilize vm failed flag to help gas estimation

cmd/puppeth, params: enable Byzantium on all networks

internal/ethapi: add status code to receipt rpc return

* core/types: make Signer derive address instead of public key

There are two reasons to do this now: The upcoming ethclient signer
doesn't know the public key, just the address. EIP 208 will introduce a
new signer which derives the 'entry point' address for transactions with
zero signature. The entry point has no public key.

Other changes to the interface ease the path make to moving signature
crypto out of core/types later.

* ethclient, mobile: add TransactionSender

The new method can get the right signer without any crypto, and without
knowledge of the signature scheme that was used when the transaction was
included.

When implementing the new bloombits based filter, I've accidentally broke null
topics by removing the special casing of common.Hash{} filter rules, which
acted as the wildcard topic until now.

This PR fixes the regression, but instead of using the magic hash
common.Hash{} as the null wildcard, the PR reworks the code to handle nil
topics during parsing, converting a JSON null into nil []common.Hash topic.

cmd/geth: fix --password typo

core/state: revert log index when removing logs

* p2p: snappy encoding for devp2p (version bump to 5)

* p2p: remove lazy decompression, enforce 16MB limit

This patch fixes the following issues:

* The contract executes send() when it does not have enough balance.
* The contract always sends a total amount of zero.

This commit introduces a network simulation framework which
can be used to run simulated networks of devp2p nodes. The
intention is to use this for testing protocols, performing
benchmarks and visualising emergent network behaviour.