When converting a negative number e.g., -2, the resulting ABI encoding
should look as follows:
fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe.
However, since the check of the type is for an uint instead of an
int, it results in the following ABI encoding:
0101010101010101010101010101010101010101010101010101010101010102. The
Ethereum ABI
(https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI) says,
that signed integers are stored in two's complement which should be
of the form ffffff.... and not 01010101..... for e.g. -1. Thus, I
removed the type check in numbers.go as well as the function S256
as I don't think they are correct. Or maybe I'm missing something?

eth/downloader: ensure cancel channel is closed post sync

eth/downloader, trie: pull head state concurrently with chain

cmd, console: split off the console into a reusable package

core, core/state, trie: enterprise hand-tuned multi-level caching

core/state: return the starting nonce for non-existent accs (testnet)

eth: enable bad block reports

misc: fix spelling mistake

eth/api: fixed GetCompilers when there is no error creating Solc

common/compiler: support relative path to solc

We used to have reporting of bad blocks, but it was disabled
before the Frontier release. We need it back because users
are usually unable to provide the full RLP data of a bad
block when it occurs.

A shortcoming of this particular implementation is that the
origin peer is not tracked for blocks received during eth/63
sync. No origin peer info is still better than no report at
all though.

README: make it clear how to build all executables

eth: add new RPC method (personal.) SignAndSendTransaction

core: Simplify bloom9 tests

eth/filter: bugfix which can cause a nil pointer crash when parsing f…

accounts/abi/bind, eth: rely on getCode for sanity checks, not estimate and call

eth/downloader: concurrent header downloads

eth: fixed regression in eth_signTransaction fixes #2578

Sign transaction returned the unsigned transaction rather than the
signed one.

node, p2p: move network config out of Server

This silences a go vet message about copying p2p.Server in package node.

eth: skip transaction handling during fast sync

cmd/geth: fix console history exclusion