Implemented proper touch revert journal entries and copied a Parity
consensus bug in order to remain in sync with the current longest chain.

1.4 HF

This commit implements EIP158 part 1, 2, 3 & 4

1. If an account is empty it's no longer written to the trie. An empty
  account is defined as (balance=0, nonce=0, storage=0, code=0).
2. Delete an empty account if it's touched
3. An empty account is redefined as either non-existent or empty.
4. Zero value calls and zero value suicides no longer consume the 25k
  reation costs.

params: moved core/config to params
Signed-off-by: NJeffrey Wilcke <jeffrey@ethereum.org>

Geth 1.4.18: Note 7

(cherry picked from commit ca419f3c)

(cherry picked from commit 82b14a05)

If geth is busy importing 2048 heavy blocks it can take a while before
it prints anything. This change ensures that a message gets printed
every 8s.

(cherry picked from commit e66b158f)

(cherry picked from commit f2be2493)

The trie sync code links subtries using pointers into node structs.
Since commit 40cdcf11 nodes are no longer copied when unpacking from
an interface value, causing all nodes to get linked up as the sync
progresses. Fix it by breaking the pointer chain with an explicit copy.

(cherry picked from commit 2cd7a039)

This implements 1b & 1c of EIP150 by adding a new GasTable which must be
returned from the RuleSet config method. This table is used to determine
the gas prices for the current epoch.

Please note that when the CreateBySuicide gas price is set it is assumed
that we're in the new epoch phase.

In addition this PR will serve as temporary basis while refactorisation
in being done in the EVM64 PR, which will substentially overhaul the gas
price code.

(cherry picked from commit 64af2aaf)

* trie: store nodes as pointers

This avoids memory copies when unwrapping node interface values.

name      old time/op  new time/op  delta
Get        388ns ± 8%   215ns ± 2%  -44.56%  (p=0.000 n=15+15)
GetDB      363ns ± 3%   202ns ± 2%  -44.21%  (p=0.000 n=15+15)
UpdateBE  1.57µs ± 2%  1.29µs ± 3%  -17.80%  (p=0.000 n=13+15)
UpdateLE  1.92µs ± 2%  1.61µs ± 2%  -16.25%  (p=0.000 n=14+14)
HashBE    2.16µs ± 6%  2.18µs ± 6%     ~     (p=0.436 n=15+15)
HashLE    7.43µs ± 3%  7.21µs ± 3%   -2.96%  (p=0.000 n=15+13)

* trie: close temporary databases in GetDB benchmark

* trie: don't keep []byte from DB load around

Nodes decoded from a DB load kept hashes and values as sub-slices of
the DB value. This can be a problem because loading from leveldb often
returns []byte with a cap that's larger than necessary, increasing
memory usage.

* trie: unload old cached nodes

* trie, core/state: use cache unloading for account trie

* trie: use explicit private flags (fixes Go 1.5 reflection issue).

* trie: fixup cachegen overflow at request of nick

* core/state: rename journal size constant

(cherry picked from commit 40cdcf11)

(cherry picked from commit 182d9cb7)

(cherry picked from commit 9e9bfc4e)

Backport TxPool limits to release/1.4

(cherry picked from commit 16d8397e)

(cherry picked from commit b4a52513)

(cherry picked from commit a183ea29)

(cherry picked from commit affffb39)

(cherry picked from commit 0ef327bb)

(cherry picked from commit 795b7042)

There is no need to use the reflection-based decoder to decode []byte.

(cherry picked from commit 3c836dd7)

The delete/remove naming has caused endless confusion in the past.

(cherry picked from commit 90fce8bf)

This commit replaces the deep-copy based state revert mechanism with a
linear complexity journal. This commit also hides several internal
StateDB methods to limit the number of ways in which calling code can
use the journal incorrectly.

As usual consultation and bug fixes to the initial implementation were
provided by @karalabe, @obscuren and @Arachnid. Thank you!

(cherry picked from commit 1f1ea18b)

Two new tests are skipped because they're buggy. Making some newer
random state tests work required implementing the 'compressed return
value encoding'.

(cherry picked from commit 1b7b2ba2)

(cherry picked from commit e482b569)

(cherry picked from commit 82e09c17)

This pulls in the assembly implementation of keccakf1600 for amd64.

(cherry picked from commit 54ea3173)

Geth 1.4.15 "Come at me bro"

(cherry picked from commit b4b5921d)

This commit tweaks the debian packaging tool:

* All build environment metadata can now be overriden on the command
  line. This allows testing the CI build behaviour locally.
* -unstable packages now actually contain the binaries (oops)
* packages use Go 1.7 to build
* archiving is skipped for PR builds

(cherry picked from commit 4f762797)

(cherry picked from commit b7159818)