* 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

* Initial design and some tests.

* Insertion & limits.

* Constructing pending block.

* Change to PendingIterator.

* Removing/cancelling transactions.

* Full status.

* Culling transactions.

* Use bigint.

* Add listener tests.

* Clean up listener types.

* Split into multiple files.

* Add copyright notice.

* Documentation.

* Don't require ownership.

* Fix cull to remove from by_hash.

* Make the queue generic over transactions.

* Address code review.

* Update wasm submodules.

* Fix review grumbles.

* Add some docs.

* Removed ethcore-util dependency

* Removed snappy

Tomasz Drwięga authored Dec 01, 2017 and Svyatoslav Nikolsky committed Dec 01, 2017

* Testing many passwords for presale wallet.

* Add multiple threads.

* WiP: ethkey brain wallets recover.

* Refactor pre-sale-wallet cracking.

* Generate in multiple threads. Brain with prefix.

* Validate bain wallet phrase.

* Brain wallet recovery.

* Self-review fixes.

* Fix tests.

* More docs.

* Bump versions.

* Remove cmd_find from borked merge.

* Update wasm submodules.

* Use threadpool.