* kvdb-rocksdb: update to RocksDB 5.8.8

* kvdb-rocksdb: tune RocksDB options

* Switch to level-style compaction
* Increase default block size (16K), and use bigger blocks for HDDs (64K)
* Increase default file size base (64MB SSDs, 256MB HDDs)
* Create a single block cache shared across all column families
* Tune compaction settings using RocksDB helper functions, taking into account
  memory budget spread across all columns
* Configure backgrounds jobs based on the number of CPUs
* Set some default recommended settings

* ethcore: remove unused config blockchain.db_cache_size

* parity: increase default value for db_cache_size

* kvdb-rocksdb: enable compression on all levels

* kvdb-rocksdb: set global db_write_bufer_size

* kvdb-rocksdb: reduce db_write_bufer_size to force earlier flushing

* kvdb-rocksdb: use master branch for rust-rocksdb dependency

* created the dir crate in util
* moved code from ethstore/src/dir/paths.rs to dir crate
* rename dir module in ethstore to accounts_dir to distinguish it
  from the dir crate
* changes after @tomusdrw on #6952

* parity-version module split from util

removed unused util deps and features

trigger buildbot again

only kvdb links rocksdb

snappy linker issues

* rm snappy

* fixed old version imports

Firstly, `Step.duration_remaining` casts it to u32, unnecesarily
limiting it to 2^32. While theoretically this is "good enough" (at 3
seconds steps it provides room for a little over 400 years), it is
still a lossy way to calculate the remaining time until the next step.

Secondly, step duration might be zero, triggering division by zero
in `Step.calibrate`

Solution: rework the code around the fact that duration is
typically in single digits and never grows, hence, it can be represented
by a much narrower range (u16) and this highlights the fact that
multiplying u64 by u16 will only result in an overflow in even further
future, at which point we should panic informatively (if anybody's
still around)

Similarly, panic when it is detected that incrementing the step
counter wrapped around on the overflow of usize.

As for the division by zero, prevent it by making zero an invalid
value for step duration. This will make AuRa log the constraint
mismatch and panic (after all, what purpose would zero step duration
serve? it makes no sense within the definition of the protocol,
as finality can only be achieved as per the specification
if messages are received within the step duration, which would violate
the speed of light and other physical laws in this case).

* detect different node, same-key signing in aura

* reduce scope of warning

André Silva authored Dec 08, 2017 and Arkadiy Paronyan committed Dec 08, 2017

* reduce max block timestamp drift to 15 seconds

* add test for block timestamp validation within allowed drift

* Fix Aura difficulty race

* fix test key

* extract out score calculation

* fix build

Tomasz Drwięga authored Dec 05, 2017 and Arkadiy Paronyan committed Dec 05, 2017

* Enable delayed maximum_uncle_count activation.

* Fix tests.

* Defer kovan HF.

It is era 49, and should correspond to ECIP1017/ECIP1039's era 50.

Fix potential rounding errors between geth and parity in the long-term future.

Tomasz Drwięga authored Nov 03, 2017 and Arkadiy Paronyan committed Nov 03, 2017

* Allow to include all queue transactions in pending block.

* Fix tests.

Nikolay Volf authored Nov 02, 2017 and Arkadiy Paronyan committed Nov 02, 2017

* Action params and embedded params handling

* fix namespaces

Tomasz Drwięga authored Nov 01, 2017 and Arkadiy Paronyan committed Nov 01, 2017

* Nonce future - reserve and dispatch

* Single thread nonce tests

* Track status of reserved nonces.

* Initialization of nonce reservations.

* Prospective Signer

* Fix cli tests.

Tomasz Drwięga authored Oct 25, 2017 and Arkadiy Paronyan committed Oct 25, 2017

* Refactor static context check in CREATE.

* Fix wasm.

This reverts commit f7ba063b.

Tomasz Drwięga authored Oct 24, 2017 and Arkadiy Paronyan committed Oct 24, 2017

* Fix serialization of non-localized transactions.

* Return proper SignedTransactions representation.