new blooms database (#8712)

* new blooms database

* fixed conflict in Cargo.lock

* removed bloomchain

* cleanup in progress

* all tests passing in trace db with new blooms-db

* added trace_blooms to BlockChainDB interface, fixed db flushing

* BlockChainDB no longer exposes RwLock in the interface

* automatically flush blooms-db after every insert

* blooms-db uses io::BufReader to read files, wrap blooms-db into Mutex, cause fs::File is just a shared file handle

* fix json_tests

* blooms-db can filter multiple possibilities at the same time

* removed enum trace/db.rs CacheId

* lint fixes

* fixed tests

* kvdb-rocksdb uses fs-swap crate

* update Cargo.lock

* use fs::rename

* fixed failing test on linux

* fix tests

* use fs_swap

* fixed failing test on linux

* cleanup after swap

* fix tests

* fixed osx permissions

* simplify parity database opening functions

* added migration to blooms-db

* address @niklasad1 grumbles

* fix license and authors field of blooms-db Cargo.toml

* restore blooms-db after snapshot

ethcore/src/verification/verification.rs

@@ -352,7 +352,7 @@ mod tests {
 
 	use std::collections::{BTreeMap, HashMap};
 	use std::time::{SystemTime, UNIX_EPOCH};
-	use ethereum_types::{H256, Bloom, U256};
+	use ethereum_types::{H256, BloomRef, U256};
 	use blockchain::{BlockDetails, TransactionAddress, BlockReceipts};
 	use encoded;
 	use hash::keccak;
@@ -474,7 +474,8 @@ mod tests {
 			unimplemented!()
 		}
 
-		fn blocks_with_bloom(&self, _bloom: &Bloom, _from_block: BlockNumber, _to_block: BlockNumber) -> Vec<BlockNumber> {
+		fn blocks_with_bloom<'a, B, I, II>(&self, _blooms: II, _from_block: BlockNumber, _to_block: BlockNumber) -> Vec<BlockNumber>
+		where BloomRef<'a>: From<B>, II: IntoIterator<Item = B, IntoIter = I> + Copy, I: Iterator<Item = B>, Self: Sized {
 			unimplemented!()
 		}