The account management API was originally implemented as a thin layer
around crypto.KeyStore, on the grounds that several kinds of key stores
would be implemented later on. It turns out that this won't happen so
KeyStore is a superflous abstraction.

In this commit crypto.KeyStore and everything related to it moves to
package accounts and is unexported.

These changes make prompting behave consistently on all platforms:

* The input buffer is now global.
  Buffering was previously set up for each prompt, which can cause weird
  behaviour, e.g. when running "geth account update <input.txt" where
  input.txt contains three lines. In this case, the first password
  prompt would fill up the buffer with all lines and then use only the
  first one.

* Print the "unsupported terminal" warning only once.
  Now that stdin prompting has global state, we can use it to track
  the warning there.

* Work around small liner issues, particularly on Windows.
  Prompting didn't work under most of the third-party terminal emulators
  on Windows because liner assumes line editing is always available.

Unlocking the accounts in the test doesn't help with anything.

rpc: several fixes and support for optional arguments

rpc: be less restrictive on the request id
rpc: improved documentation
console: upgrade web3.js to version 0.16.0
rpc: cache http connections
rpc: rename wsDomains parameter to wsOrigins

cmd/geth: add JS preload parameter

Update ethash

cmd/utils: bugfix where database is opened multiple times

console: use transaction output formatter for eth.pendingTransactions…

accounts/abi/bind: support generating bindings for various arrays

rpc: use go-winio instead of vendoring a named pipe implementation

RPC pub sub

core, miner: remove Frontier canary

abi: support for input and output slices & removed support for implicit type conversion

p2p: enable EIP-8 handshake sending

cmd/utils, miner: A/B testing JIT VM. Disabled for miners

cmd/geth: add missing gas target flag (fixing 0 convergence issue)

With the Ethereum Homestead fork is now behind us, we can
assume that everyone runs an EIP-8 capable client.

cmd/geth: fix startup with empty database

This prevents display of the warning for --dev and --olympic.

accounts/abi/bind: surface raw wrappers to access low level ops

common: added Hash unmarshal json length validation

This PR introduces a 10% probability that you'll run the client with the
JIT enabled testing the new client and helps us potentially catch
errors when reported.

This feature is **disabled** for miners (disabling the JIT completely).
The JIT can however be force for miners if they enable both --jitvm and
--forcejit.

eth: enforce signing hashes using eth_sign instead of arbitrary data

core: homestead chain configuration & artificial gas floor target mining flag